Isabel de Clare, 4th Countess of Pembroke, was the daughter of Richard de Clare (Strongbow), 2nd Earl of Pembroke, and his wife Aoife of Leinster. After the death of her brother Gilbert, Isabel became one of the wealthiest heiresses in Britain. Isabel de Clare had 5 sons and 5 Daughters: William; Richard; Maud; Gilbert; Walter; Anselm; Isabel; Sibyl; Joan; and Eva. All five of the sons would attain the rank of Earl of Pembroke. Isabel de Clare would die in 1220, a year after the death of her husband William Marshall, and she was buried in Tintern Abbey in Monmouthshire, Wales. William Marshall was buried at the Temple Church in London. His tomb and effigy are extant today in the Temple Church. Isabel's mother Aoife of Leinster, daughter Maude, and her sons Anselm and Walter were buried at Tintern Abbey.