From the LCMS website:
Katharina von Bora (1499–1552) was placed in a convent when still a child and became a nun in 1515. In April 1523 she and eight other nuns were rescued from the convent and brought to Wittenberg. There Martin Luther helped return some to their former homes and placed the rest in good families. Katharina and Martin were married on June 13, 1525. Their marriage was a happy one and blessed with six children. Katharina skillfully managed the Luther household, which always seemed to grow because of his generous hospitality. After Luther’s death in 1546, Katharina remained in Wittenberg but lived much of the time in poverty. She died in an accident while traveling with her children to Torgau in order to escape the plague.