Malcolm III Canmore vs Peter I of Bulgaria

Malcolm Canmore killed Macbeth at the Battle of Lumphanan, ending Macbeth's reign. Malcolm then claimed the Scottish throne, though he faced opposition from Macbeth's stepson Lulach, whom he killed in 1058 to secure his position.

Malcolm launched a series of raids into northern England, exploiting the instability after the Norman Conquest. He invaded Northumbria in 1070 and again in 1079, but was forced to submit to William the Conqueror at the Treaty of Abernethy in 1072, becoming a vassal.

Malcolm married Margaret, an Anglo-Saxon princess who had fled to Scotland after the Norman Conquest. The marriage strengthened ties with the English church and nobility, and Margaret later became a saint. It also introduced English cultural and religious influences to the Scottish court.

Malcolm invaded England again and was killed at the Battle of Alnwick in Northumberland, along with his eldest son Edward. His death led to a succession crisis in Scotland, as his brother Donald III seized the throne, beginning a period of instability.

Peter I ruled Bulgaria for over 40 years, a period marked by peace with the Byzantine Empire and internal stability. He maintained the treaty signed with Byzantium and focused on consolidating the state.

Peter I was recognized as Tsar of Bulgaria by the Byzantine Empire and married Maria Lekapene, the granddaughter of Byzantine Emperor Romanos I. This marriage solidified the peace treaty and elevated Bulgaria's status.