Eleanor married Michael Korybut Wiśniowiecki (known as Michael I), King of the Polish-Lithuanian Commonwealth, on 27 February 1670 in the Jasna Góra Monastery. They had one stillborn son on 29 November 1670. In 1671, she had a miscarriage. The opposition of Michael spread rumours that Michael forced her to fake pregnancies, but this is not considered likely. Queen Eleanor was regarded as a model of goodness, softness and loyalty toward her spouse. She learned Polish, although she preferred Latin, and accompanied Michael on his official journeys around Poland. Her husband died in 1673. She remained in Poland for a couple of years after his death.