Okay, here's my ideas for this.
Kingdom of Northumbria (Aldfrith)
Start Bias: Grassland
Capital: Durham
UA:
Haliwerfolc
+1
Faith in the
Capital for each allied
City-State. Cities with a Land Unit garrisoned inside them gain a +33%
Production bonus towards Land Units.
UU:
Thegn (replaces Horseman)
-1
Movement, but does not require Horses and does not count as a Mounted Unit. Starts with a unique promotion, "Corporax Banner", that grants a +15%
Combat Bonus to every friendly unit within one hex.
UB:
High Cross (replaces Amphitheatre)
+2
Culture. Contains unfilled slots for both a
Great Work of Art and a
Great Work of Writing. When both are filled, generate +2
Faith for each building in the City that increases the Experience of Units trained within it.
EDIT: Okay, some explanations are needed. The UA name is the term "haliwerfolc", which was taken by the people of the County Palatine of Durham to represent both their English (rather than Norman) heritage and to bolster their connection with St. Cuthbert, who was purportedly given vast tracts of land (not like that) after being appointed Bishop of Lindisfarne. The Thegn's name origins we know about already, but the promotion name comes from the Battle of Neville's Cross, just prior to which the Prior of Durham Abbey purportedly received a vision of St. Cuthbert demanding him to take his corporax cloak, a relic of his, and tie it to a spear-point to function as a banner. It seemed to work, since they kicked nine kinds of hell out of the invading Scots, and they reported being "protected by the mediation of the holy St. Cuthbert". Thus it seemed only fitting to give it a mini-Great General effect, to restore some dignity to the much-maligned Horseman. Lastly, the High Crosses are pretty much everywhere, featuring scenes from the lives of the saints intricately carved into them. This just screams Culture Building at me, but there are already a
lot of Monument replacements, so I plumped for the Amphitheatre instead. This way, it can indirectly bolster the offensive nature of this Civ by encouraging Barracks, Armouries, Military Academies, and so on.
Hope this is useful! =]