question: When did Albrecht Of Saxe-Weissenfels's mother die?
context: Title: Albrecht of Saxe-Weissenfels
  Passage: Albrecht of Saxe- Weissenfels( 14 April 1659 in Halle – 9 May 1692 in Leipzig), was a German prince of the House of Wettin. He was the fifth and youngest son of August, Duke of Saxe- Weissenfels, and his first wife, Anna Maria of Mecklenburg- Schwerin.
  Title: Anna Maria of Mecklenburg-Schwerin
  Passage: Anna Maria of Mecklenburg- Schwerin( 1 July 1627, in Schwerin – 11 December 1669, in Halle) was a German noblewoman, a member of the House of Mecklenburg and by marriage Duchess of Saxe- Weissenfels. She was the fourth child and second daughter of Adolf Frederick I, Duke of Mecklenburg- Schwerin by his first wife Anna Maria, daughter of Enno III, Count of Ostfriesland. In older historiography she appears with a third name," Dorothea", but modern historians have discarded it.
answer: 11 December 1669
citations: Albrecht of Saxe-Weissenfels Anna Maria of Mecklenburg-Schwerin