Mize, in the Middle Ages there were very few families with kids in the double digits, because children were dying like flies - especially in poor families - therefore women could not conceive and bear new children at rates sufficient for those living children to number 10 or more at any given point in time. The reason why your granddad had 8 or 9 siblings in the 1900s is because children already stopped dying like flies, but adults didn't yet start to use contraception.
However, this cannot be extrapolated into the Early Middle Ages, when typically 40-50% of children were dying before the age of 5.
daft said:
You make kids, lots and lots of kids.
There was no Baby Milk available to buy, so mothers couldn't afford to make a new kid before they stopped breastfeeding previous one.
Mize said:
And we come back to demographics and the simple fact that Slavs were farmers.
Slavs were farmers, Balts were farmers, Germanics were farmers, Ugro-Finns were for the most part also farmers (though some were still hunters).
Vast majority of "barbarians" in Europe were farmers - nothing special about Slavs with that.
Anglo-Saxons were also farmers, and they migrated to Britain because it had better pastures for their cattle than Denmark / North Germany.
Tolni said:
when the Slavs came in to the Balkan peninsula, there were no soldiers due to the fact all forces were lifted to fight the Arabs in Levant.
No Tolni. The border on the Balkans wasn't left completely undefended. There are also written accounts about battles against Slavs.
Oh - and by the way, Arab migration to the Levant took place ca.
one hundred years after Slavic migration to the Balkans.
When the Slavs came, Eastern Roman forces were fighting not the Arabs, but the Germanic tribes in Italy, Iberia and North Africa:
http://en.wikipedia.org/wiki/Belisarius#Military_campaigns
Slavs hit the Balkan frontier when Belisarius was preoccupied with taking back Western Roman land from various Germanic chieftains.
BTW, there are accounts which say that some Slavs also fought under command of Belisarius, as foederati or mercenaries.
Mize said:
Long answer: they didn't really capture the cities.
They indeed didn't capture the most well-defended / best-fortified cities, such as for example Thessaloniki or Constantinople.
But many smaller cities and towns - such as for example Topirus (modern name: Corlu, in East Thrace) - were captured by Slavs.
Mize said:
or more precisely, Slavophonic, understand here, there is no Slavic 'ethnicity', 'gene', whatever, it's a language
Language is a mark of ethnicity and languages tended to spread with migrating humans, rather than by wind:
From "The Geography of Recent Genetic Ancestry across Europe":
http://journals.plos.org/plosbiology/article?id=10.1371/journal.pbio.1001555
(...) There is also substantial regional variation in the number of shared genetic ancestors. For example, there are especially high numbers of common ancestors shared between many eastern populations that date roughly to the migration period (which includes the Slavic expansion into that region). (...)
(...) We quantify this ubiquitous recent common ancestry, showing for instance that even pairs of individuals from opposite ends of Europe share hundreds of genetic common ancestors over this time period. Despite this degree of commonality, there are also striking regional differences. Southeastern Europeans, for example, share large numbers of common ancestors that date roughly to the era of the Slavic expansion around 1,500 years ago. (...)
Though of course Slavs were genetically diverse people, like any other ethnic group.
Ethnicity is a cultural phenomenon (and language is an important part of culture), not a genetic phenomenon. So Slavic ethnicity existed.
Today there is no Germanic or Slavic ethnicity. But they existed in the past, before those peoples branched into more ethnic groups.