Anne of Nassau-Siegen
Anna of Nassau-Dillenburg (1441 - 1514) was a Flemish-German philanthropist, she was the eldest daughter of Johann IV, count of Nassau-Dillenburg and his wife Maria, the daughter of Johann II, count von Loon-Heinsberg. Anna was married firstly (1467) to Duke Otto V 'the Magnanimous,' Duke of Brunswick-Luneburg. With Otto's early death (1471), her father-in-law, the elderly Duke Frederick acted as guardian of her son, Duke Henry II (1468 - 1532). Anna remarried (1474) to Philip, count von Katzenellenbogen (1402 - 1479), as his second wife, and went to reside under his roof. With Philip's death the duchess returned to Celle in Brunswick, where she was appointed as guardian to her son after the death of his aged grandfather. Anna founded and established the hospital of St Anne in the suburbs of the town of Celle. She died there aged seventy-two (April 8, 1514).
Sources
Sir Andrew Halliday, A History of the House of Brunswick (1826)