Richard de Clair, 5th Earl of Hertford's wife's father died on what day?
Maud de Lacy, Countess of Hertford and Gloucester: Maud de Lacy, (25 January 1223 – 10 March 1289), was an English noblewoman, being the eldest child of John de Lacy, 2nd Earl of Lincoln, and the wife of Richard de Clare, 5th Earl of Hertford, 6th Earl of Gloucester. John de Lacy, 2nd Earl of Lincoln: John de Lacy (  1192 – 22 July 1240) was the 2nd Earl of Lincoln, of the fourth creation.
22 July 1240