Albert the Bear
Albert the Bear (1100 – 18 November 1170) was the first Margrave of Brandenburg (as Albert I) from 1157 to his death and was briefly Duke of Saxony between 1138 and 1142.
Hartwig of Uthlede
Hartwig of Uthlede( died 3 November 1207) was a German nobleman who – as Hartwig II – Prince- Archbishop of Bremen( 1185–1190 and de facto again 1192 – 1207) and one of the originators of the Livonian Crusade.
Gerhard II (archbishop of Bremen and Hamburg)
Gerhard II. of Lippe was an archbishop of Bremen& Hamburg.
He was born at about 1190 as a son to Bernard II of the House of Lippe that ruled the lordship of Lippe in Westphalia.
He was prince archbishop of Bremen and Hamburg from 1219 to his death on 28 August 1258.
He fought some quarrels against the citizens of Bremen who gained for more autonomy of their city, with successes and defeats on both sides.
He organized the crusade against the rural republic of Stedingen.
Under his rule, the first bridge across the Weser in Bremen was built, as an enterprise of the counts of Neubruchhausen.
And he made a great relaunch of Bremen Cathedral, he began to build the couple of huge western towers and he displaced the flat ceilings of the naves by vaults.
These works were started in pure romanesque style and finished in gothic style.
Albert II of Brunswick-Wolfenbüttel
Albert II of Brunswick- Wolfenbüttel( died 14 April 1395) was Prince- Archbishop of Bremen in the years 1361 – 1395.
Henry of Saxe-Lauenburg
Henry of Saxe- Lauenburg
( 1 November 1550 – 22 April 1585, Vörde) was a Prince- Archbishop of Bremen( as" Henry III"), then Prince- Bishop of Osnabrück( as" Henry II"), then Prince- Bishop of Paderborn( as" Henry IV").
Burkhard von Weisbriach
Burkhard von Weisbriach( died 1466) was a German Roman Catholic cardinal and Prince- Archbishop of Salzburg from 1461 until his death.
Hildebold of Wunstorf
Hildebold of Wunstorf(?- 1273), also Hildbold, was the Prince- Archbishop of Bremen from 1258 until his death.
Siegfried, Prince-Archbishop of Bremen
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.
Sigismund of Brandenburg
Sigismund of Brandenburg( 1538 – 1566) was Prince- Archbishop of Magdeburg and Administrator of the Prince- Bishopric of Halberstadt.
Vinzenz Eduard Milde
Vinzenz Eduard Milde( 1777, in Brünn, Moravia – 1853 at Vienna) was Prince- Archbishop of Vienna.
He was the first Prince- Archbishop and commoner: the see had always hitherto been occupied by a nobleman.

Question: Which country Siegfried, Prince-Archbishop Of Bremen's father is from?
Answer: Saxony