Father Sir Walter de Lacy, Sheriff of Herefordshire, Lord of Meath b. c 1172, d. Feb 1241
Mother Margaret de Brewes b. c 1177
Egidia de Lacy was born circa 1200 at of Dublin, Dublin, Ireland.
She married Richard de Burgh, Lord Connaught, Justiciar of Ireland, son of William de Burgh, Seneschal of Munster and (Miss) O'Brien, before 21 April 1225.
They had 3 sons (Richard; Sir Walter, 2nd Earl of Ulster; & William Og) & 4 daughters (Margery, wife of Thebaud le Boteler; Mathilda, wife of Gerard de Prendergast; Alice; & (unnamed), wife of Hamon de Valoines).
She married second Richard de Rochester.
Egidia de Lacy died after 22 February 1247. 
... as her first marriage, EGIDIA de Lacy, daughter of WALTER de Lacy Lord of Meath & his wife Margery de Briouse (-[22 Feb 1247/5 Nov 1248]).
A charter dated 22 Feb 1247 records the homage of Richard son and heir of Richard de Burgh for all his father´s lands…in Ireland…saving the dower of Egidia, who was Richard´s wife.
She married secondly Richard de Rochester.
Her second marriage is confirmed by a charter dated 8 Oct 1249 which records that the Dominican friars of London have shown to the king that Egidia, who was the wife of Richard de Burgh senior, received 180 marks in which Richard was bound to Hubert de Burgh late Earl of Kent and which the Earl had left by his will to the friars, and that Richard of Rochester who subsequently married Egidia wasted her chattels and the order to restore property to the friars. A charter dated 5 Nov 1248 mandates Peter de Bermingham to cause dower to be assigned to Alice who was the wife of Richard de Burgh…son and heir of Richard de Burgh who died in the king´s service at Bordeaux" and to have dower "of all the lands whereof Egidia, who was the wife of the latter, was endowed
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