Decade of 1080s
1080: The Byzantines are defeated by the Turks in Cappadocia, opening Central Anatolia to periodic Turkish raids.
1081: Following the conversion of the chiefs of Cracow, the Roman duchy of the Lesser Poland is officially established. Prussia, Masuria and Masovia remain as buffer disputed territories with the rising (Pagan) Kingdom of Lithuania.
1082: Final campaign of the Romans in Mercia: the last strongholds of the Danes in Britain are conquered. The Norwegians continue their expansion by northern Northumbria and Caledonia.
1083: Establishment of the eight Roman duchies in Britain: Cornwall, Wessex, Kent, East England, West England, Mercia, Southumbria and Northumbria (the part not controlled by Norway).
1084: After the death without male heirs of King García III the Blind in Asturias, this kingdom is officially absorbed by the Roman Empire, after decades of strong vassalization.
1085: Successful Byzantine expedition to Alexandria for supporting the Christian rebels: the Sultanate loses effective control over the Delta of the Nile.
1086: The Roman duchy of Lusitania gains control over the southwestern Iberian peninsula, reaching the cape of Saint Vincent.
1087: The Roman-Norwegian settlement in Terra Nova is expanded to the southern shores, while the local Native American tribes are severly hit by an epidemic of smallpox, thus depopulating the island.
1088: Norway completes the conquest of Caledonia: Britain is definitely divided in two parts, a Norwegian lesser part in the North and a Roman greater part in the South. Wales and Cumbria keep their independence.
1089: The Turkish Empire incorporates all the Yemen to its dominion, leaving the weak Emirate of Medina as the only entity in Arabia out of its control.