Isaac II Angelos (or Angelus) (September 1156 – January 1204) is Byzantine Emperor from 1185 to 1195, and again from 1203 to 1204.

His father Andronikos Dukas Angelos, a military leader in Asia Minor (c. 1122 – aft.

1185), married bef.

1155 Euphrosyne Kastamonitissa (c. 1125 – aft.

1195).

Andronikos Dukas Angelos was the son of Konstantinos Angelos, Admiral of Sicily (c. 1085 – aft.

July 1166, son of Manolis Angelos from Philadelphia) and Theodora Komnene (b.

15 January 1096/1097) who was the youngest daughter of Emperor Alexios I Komnenos and Eirene Doukaina.

Thus, Isaac is a member of the extended imperial clan.