Pope Leo X: Did you mean...?

Martin Luther's 95 Theses of 31 October 1517, although they have since come to represent the beginning of the Protestant Reformation, were not written to challenge the authority of the Roman Catholic Church but were simply an invitation to...

Pope Leo IX (r. 1049-1054), illustration from an illuminated manuscript, 11th century.

The Investiture Controversy, also referred to as the Investiture Contest or Investiture Dispute, was a conflict lasting from 1076 to 1122 between the papacy of the Catholic Church and the Salian Dynasty of German monarchs who ruled the Holy...

The Diet of Worms (January-May 1521) was the assembly convened by Charles V, Holy Roman Emperor to address, among other issues, the works of the reformer Martin Luther (l. 1483-1546) who openly criticized the Church. Luther was told to recant...

Frederick II (l. 1194-1250 CE) was the king of Sicily (r. 1198-1250 CE), Germany (r. 1215-1250 CE), Jerusalem (r. 1225-1228 CE), and also reigned supreme as the Holy Roman Emperor (r. 1220-1250 CE). He was born in Jesi in 1194 CE but spent...

Germanic influence reigned in the Roman Empire from the end of the 4th century CE through the 5th. Germanic individuals took important posts in the government and the military, and Germanic tribes penetrated ever further into lands that had...

The Battle of Civitate was fought in southeastern Italy on 18 June 1053 between a papal army of Pope Leo IX (r. 1049-1054) and an outnumbered force of Norman knights seeking recognition of their conquests and titles. The Normans were victorious...

Johann Tetzel (l.c. 1465-1519) was a Dominican Friar who became famous as one of the most effective indulgence salesmen and who inadvertently inspired the Protestant Reformation when Martin Luther (l. 1483-1546) wrote his 95 Theses protesting...

Romanos I Lekapenos (“the Ignorant”) was emperor of the Byzantine Empire from 920 to 944 CE. Of Armenian descent, he was a military commander who usurped the throne to rule as co-emperor with the rightful heir, but still minor, Constantine...

Michael II the Amorion, also known as Michael “the Stammerer”, was emperor of the Byzantine Empire between 820 and 829 CE. He founded the short-lived Amorion dynasty, named after his hometown in Phrygia, which would last until 867 CE. Surviving...