Juliana of Stolberg

Juliana, Countess of Stolberg-Wernigerode was the mother of William the Silent, the leader of the successful Dutch Revolt against the Spanish in the 16th century.

Juliana was born in Stolberg as the daughter of Bodo VIII, Count of Stolberg-Wernigerode and Anna of Eppstein-Königstein. She was raised a Roman Catholic but changed her religion twice, first to Lutheranism and later to Calvinism. She, along with her second husband, was a convinced Protestant and raised their children in the Protestant ways. After the death of her second husband in 1559 she remained living at Dillenburg castle, now belonging to her second son John, where she died in 1580.

Source: Wikipedia