Mention of Catherine Mortimer (aka Catrin ferch Owain Glyn Dwr) reminds me that there's a monument to her and her children in London. A picture is linked here. I can't honestly say that it appeals to my personal taste, but then modern art rarely, if ever, does.
The monument is on the site of St.Swithin's Church, where they were buried, and is also supposed to represent the suffering of women and children in warfare, which is a noble enough aim.
Catrin was buried with her daughters at the expense of Henry V's government, four years after her capture at the fall of Harlech. The cost was a massive £1, apparently. What happened to her son, Lionel, is unknown. He simply disappeared. Many people conveniently 'disappeared' while in Tower custody over the years, notably during Henry VIII's time, but, with two exceptions, this tends to get overlooked.