Anna of Oldenburg (14 November 1501 – 24 September 1575) was a Countess consort of East Frisia as the spouse of Count Enno II of East Frisia. She was the Regent of East Frisia in 1542–1561 as the guardian for her minor sons, Johan II and Edzard II. Her reign lasted until 1561 and was generally supported by the Estates.
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Early life
Anna was born in Oldenburg as the only daughter of Count Johann ΧΙV von Oldenburg-Delmenhorst (1483-1526) and Princess Anna von Anhalt-Zerbst (1460-1531). She had four surviving brothers Johann VI, Georg, Christopher and Anton I.
She married count Enno II of East Frisia in 1530.
Regency
In 1540, Enno II of East Frisia died, and was succeeded by their minor son, Edzard II. Anna was appointed regent of the regency government in 1542. Her chief advisor was her brother, count Christopher of Oldenburg.
The main characteristic of her policy towards the Reformation was an effort to balance the various confessions and allow them to coexist. She adhered to the faith herself, but saw that among the East Frisian nobility Lutheranism and Zwinglianism were about equally distributed. It was clear that a selection of one of these as the state religion of East Frisia, would not be enforceable. Catholics and Spiritualists were also allowed to practise their faith in East Frisia. Only under pressure from the emperor, was Baptism forbidden in 1549. The main church administrator at her court until 1550 was Polish reformer Jan Łaski.