Answer: Joan of Navarre
Born in Brittany, Joan became queen after marrying Henry IV in 1402, becoming stepmother to his six children. It was an affectionate partnership, and he gave her a huge annual dowry of 10,000 marks. After his death in 1413, Joan chose to stay in England rather than returning to Brittany. But England and France were in the middle of the Hundred Years War, and Henry V decided Joan’s dowry could be better spent on martial purposes.
So when Joan was accused by a priest of in 1419 plotting to kill the king through witchcraft, it gave him a convenient excuse to imprison her, confiscate her property and cut her dowry. She was imprisoned for three months at Pevensey before being moved to Leeds Castle, where she spent nearly three years. Henry V died in 1422 and before his death he ordered Joan to be released and for her property to be restored.
Give yourself half a point if you answered Eleanor, duchess of Gloucester. She was likewise accused of witchcraft, and was imprisoned in three sheds next to the Jewel Tower in the 1440s.