In a discussion group, I was alerted to the current Wikipedia entry on Jacquetta Woodville ("Wydeville" for you purists here). Among other misinformation, it contains this particular gem:
"She arranged for her 20-year-old son, John Woodville, to marry the widowed and very rich dowager Duchess of Norfolk, Catherine Neville. The bride was at least forty years older than the groom at the time of the wedding. The marriage caused a furore and earned the Woodvilles considerable unpopularity. Catherine Neville's son, John de Mowbray, 3rd Duke of Norfolk, especially, turned against the Queen and her family and vowed vengeance against them and the Yorkists for the stain on his family honour."
Our Wikipedia writer is correct about the age gap, though whether Jacquetta herself arranged the marriage is open to debate. But John de Mowbray, third Duke of Norfolk, vowing vengeance? Minor hitch: The wedding between John and his elderly bride took place in 1465, and the third duke died in 1461.
We also are informed that Richard III ordered Parliament in 1483 to attaint Elizabeth Woodville for witchcraft, though Richard III didn't hold a Parliament in 1483 and Elizabeth was never attainted, for witchcraft or for anything else. Jacquetta also gains two nonexistent children courtesy of Wikipedia: Agnes and Thomas. Since "Thomas Woodville" is referred to as marrying Anne Holland, I presume that he is being confused with Thomas Grey, Jacquetta's grandson, but where on earth Agnes came from I don't know, though she seems to pop up on other genealogical sites from time to time.