Siegfried (archbishop of Bremen)

The seal of Bishop Siegfried I of 1173. Inscription: SIFRID[VS] BRANDABVRGENSIS EP[ISCOPV]S. Omissions in edged brackets.

Siegfried of Anhalt (c. 1132 – 24 October 1184) was born as the third son of Sophie of Winzenburg and her husband Albert the Bear, then Count of Anhalt, of the House of Ascania. In 1168 he was elected Archbishop of Bremen. Afterward he became Prince-Bishop of Brandenburg (1173–1179) as Siegfried I. In 1179 he succeeded in getting it upgraded to a Prince-Archbishopric of imperial immediacy in 1180, thus becoming Prince-Archbishop of Bremen. He was a strong advocate of Ascanian clan interests.