Domen
Misico dux Vandalorum
I've just found this article (in Polish):
http://www.archeo.uw.edu.pl/swarch/Swiatowit-r2001-t3_(44)-nB-s205-212.pdf
"Phenotype of old Slavs, 6th to 10th centuries", by Łukasz M. Stanaszek.
I. Byzantine sources:
1. Procopius of Caesarea (6th century):
- "(...) Valerian chose one of the Sklaveni who are men of mighty stature. (...)"
- "(...) Nay further, they do not differ at all from one another in appearance. For they are all exceptionally tall and stalwart men, while their bodies and hair are neither very fair or very blonde, nor indeed do they incline entirely to the dark type, but they are slightly ruddy in color. (...)"
2. Theophilact Simokatta (describing events from year 595):
"(...) The Emperor was with great curiosity listening to stories about this tribe, he has welcomed these newcomers from the land of barbarians, and after being amazed by their height and mighty stature, he sent these men to Heraclea. (...)"
3. Theophanes the Confessor (describing the same event from year 595):
"(...) The Emperor was admiring their beauty and their stalwart stature. (...)"
4. Pseudo-Maurice (Strategikon) - late 6th century / early 7th century:
"(...) Tribes of Sclaveni and Antes (...) are very resistant to hardships, they easily endure both heat and cold, rain and lack of garment. (...)"
5. Constantine Porphyrogennetos (10th century):
About ancestors of Balkan Croats and ancestors of Balkan Serbs:
"(...) their ancestors were Pagan Croats and Serbs, known also as White [Croats and Serbs]. Great Croatia, called also White [Croatia], until today is still Pagan, just like neighbouring [Lusatian / West Slavic] Serbs [Sorbs] (...)"
II. Muslim and Sephardi Jewish sources:
6. Al-Baladuri (late 7th century):
"(...) Slavs are a tribe of ruddy complexion and fair hair. (...)"
7. Ibn Qutajba (describing events from years 691 - 694):
"(...) If only Prince wanted, outside of his doors would be black Sudanians or ruddy Slavs (...)"
The same information is repeated also by 8. Al-Baladuri (9th century).
9. Al-Ahtal (late 7th century):
"(...) Birds of the desert saw in those people a crowd of fair-haired Slavs. (...)"
10. Jaqut (13th century, but using much older primary sources):
"(...) Slavs are a tribe of ruddy complexion and fair hair. (...)"
11. Ibn Al-Kalbi (late 8th century / early 9th century):
"(...) Slavs are a numerous nation, fair-haired and of ruddy [pink] complexion. (...)"
12. Al-Gahiz (early 9th century):
"(...) Among Slavs, abominable and ugly are their smoothness of hair [as opposed to curly hair] and delicateness, as well as blond or ruddy colour of their hair and beards, and also whiteness [bright blond colour] of their eyelashes (...)"
Al-Gahiz:
"(...) Tell me friend, after how many generations a Zang became black, and a Slav became white? (...)"
13. Abraham ben Jacob (years 965 - 966):
"(...) What is peculiar [when it comes to Slavs], most of Bojema people [Bohemians / Czechs] are of swarthy complexion and dark hair, while fair colors are rare among them [compared to frequencies among other West and East Slavs]. (...)"
Abraham ben Jacob:
"(...) Slavic people are often haunted by two diseases (...) these are two types of rash: redness and abscess (...)"
14. Ibn Al-Faqih (10th century):
"(...) There exist two kinds of Slavic people. First kind are people of swarthy complexion and dark hair. They live near the coast of the [Mediterranean] Sea. The other kind are fair people, who live inland. (...)"
Ibn Al-Faqih:
"(...) Inhabitants of Iraq are people (...) who are not born with hair colour intermediate between russet, blond, matt-white and white [bright blond], as it happens among children born from Slavic women. (...) People of Iraq are free from russet hair colour of Slavs. (...)"
15. Al-Masudi (10th century):
He writes that dominant complexion among Slavic people is fair, not dark.
III. German sources:
15. Saint Bruno of Querfurt:
He wrote that in Poland having a beard is a common custom among men.
==============================
Chart:
English summary:
================================
Let's also add something to these sources mentioned above:
And Pseudo-Caesarius of Nazianzus (6th century) when describing Slavs did not mention hair colour, only that "they are numerous and tall".
He confirms info given by Procopius and others who lived during the 6th century, that Slavs were "exceptionally tall".
=================================
Overall conclusion:
What can be observed is increasing differentation of Slavic people when it comes to appearance throughout centuries.
Relatively homogenous in appearance during the 6th century, Slavs begin to diversify in appearance after expansion.
This is most sharply visible when we compare appearance of West and East (North) Slavs with that of South Slavs.
http://www.archeo.uw.edu.pl/swarch/Swiatowit-r2001-t3_(44)-nB-s205-212.pdf
"Phenotype of old Slavs, 6th to 10th centuries", by Łukasz M. Stanaszek.
I. Byzantine sources:
1. Procopius of Caesarea (6th century):
- "(...) Valerian chose one of the Sklaveni who are men of mighty stature. (...)"
- "(...) Nay further, they do not differ at all from one another in appearance. For they are all exceptionally tall and stalwart men, while their bodies and hair are neither very fair or very blonde, nor indeed do they incline entirely to the dark type, but they are slightly ruddy in color. (...)"
2. Theophilact Simokatta (describing events from year 595):
"(...) The Emperor was with great curiosity listening to stories about this tribe, he has welcomed these newcomers from the land of barbarians, and after being amazed by their height and mighty stature, he sent these men to Heraclea. (...)"
3. Theophanes the Confessor (describing the same event from year 595):
"(...) The Emperor was admiring their beauty and their stalwart stature. (...)"
4. Pseudo-Maurice (Strategikon) - late 6th century / early 7th century:
"(...) Tribes of Sclaveni and Antes (...) are very resistant to hardships, they easily endure both heat and cold, rain and lack of garment. (...)"
5. Constantine Porphyrogennetos (10th century):
About ancestors of Balkan Croats and ancestors of Balkan Serbs:
"(...) their ancestors were Pagan Croats and Serbs, known also as White [Croats and Serbs]. Great Croatia, called also White [Croatia], until today is still Pagan, just like neighbouring [Lusatian / West Slavic] Serbs [Sorbs] (...)"
II. Muslim and Sephardi Jewish sources:
6. Al-Baladuri (late 7th century):
"(...) Slavs are a tribe of ruddy complexion and fair hair. (...)"
7. Ibn Qutajba (describing events from years 691 - 694):
"(...) If only Prince wanted, outside of his doors would be black Sudanians or ruddy Slavs (...)"
The same information is repeated also by 8. Al-Baladuri (9th century).
9. Al-Ahtal (late 7th century):
"(...) Birds of the desert saw in those people a crowd of fair-haired Slavs. (...)"
10. Jaqut (13th century, but using much older primary sources):
"(...) Slavs are a tribe of ruddy complexion and fair hair. (...)"
11. Ibn Al-Kalbi (late 8th century / early 9th century):
"(...) Slavs are a numerous nation, fair-haired and of ruddy [pink] complexion. (...)"
12. Al-Gahiz (early 9th century):
"(...) Among Slavs, abominable and ugly are their smoothness of hair [as opposed to curly hair] and delicateness, as well as blond or ruddy colour of their hair and beards, and also whiteness [bright blond colour] of their eyelashes (...)"
Al-Gahiz:
"(...) Tell me friend, after how many generations a Zang became black, and a Slav became white? (...)"
13. Abraham ben Jacob (years 965 - 966):
"(...) What is peculiar [when it comes to Slavs], most of Bojema people [Bohemians / Czechs] are of swarthy complexion and dark hair, while fair colors are rare among them [compared to frequencies among other West and East Slavs]. (...)"
Abraham ben Jacob:
"(...) Slavic people are often haunted by two diseases (...) these are two types of rash: redness and abscess (...)"
14. Ibn Al-Faqih (10th century):
"(...) There exist two kinds of Slavic people. First kind are people of swarthy complexion and dark hair. They live near the coast of the [Mediterranean] Sea. The other kind are fair people, who live inland. (...)"
Ibn Al-Faqih:
"(...) Inhabitants of Iraq are people (...) who are not born with hair colour intermediate between russet, blond, matt-white and white [bright blond], as it happens among children born from Slavic women. (...) People of Iraq are free from russet hair colour of Slavs. (...)"
15. Al-Masudi (10th century):
He writes that dominant complexion among Slavic people is fair, not dark.
III. German sources:
15. Saint Bruno of Querfurt:
He wrote that in Poland having a beard is a common custom among men.
==============================
Chart:
English summary:
================================
Let's also add something to these sources mentioned above:
The earliest Arabic-Slavic contacts can probably be traced all the way to the 500's, and most likely occured on or near the territory of the East Roman (Byzantine) Empire. The earliest Arabic sources describe the Slavs as a people with pale skin, that turns "red" while under the sun, and blond hair. The Arabs even referred to a certain kind of a white coloured bean as Saqalibiya (Slavic), as we learn from the Kitab al-Filaha, a treatise on agriculture written by Ibn al-'Avvam at the end of the 12th century; the bean's colour apparently reminded them of the colour of the Slavs' hair. The first confirmed instance of the Slavs meeting the Arabs is mentioned by the Byzantine chronicler Teofanes (Teophanes), who wrote in the early 9th century; according to him in 664 a group of 5 000 Slavic (Sklavinoi) mercenaries in the Byzantine service joined the victorious army of the Omayyad (Umayyad) Caliph Mu'avyi I (reigned 661-680) who was returning from a campaign in Asia Minor. The caliph settled these Slavs in an area near the city of Apamea in northern Syria.
And Pseudo-Caesarius of Nazianzus (6th century) when describing Slavs did not mention hair colour, only that "they are numerous and tall".
He confirms info given by Procopius and others who lived during the 6th century, that Slavs were "exceptionally tall".
=================================
Overall conclusion:
What can be observed is increasing differentation of Slavic people when it comes to appearance throughout centuries.
Relatively homogenous in appearance during the 6th century, Slavs begin to diversify in appearance after expansion.
This is most sharply visible when we compare appearance of West and East (North) Slavs with that of South Slavs.