Lacy of Ireland, and Herefordshire, England
Hugh I de Lacy b abt 1010, prob Normandy. He md Emma abt 1032. She was b abt 1015.
Children of Unknown de Lacy and Emma were:
Ilbert de Lacy [a], Lord of Pontefract, b abt 1036, prob Normandy, d abt 1093. He md Hawise abt 1058. She was b abt 1042.
Child of Ilbert de Lacy and Hawise was:
Walter de Lacy [d], Lord of Weobley, b abt 1042, prob Normandy, d 27 Mar 1085. He md Ermeline abt 1066. She was b abt 1048.
Children of Walter de Lacy and Ermeline were:
Child of Emma de Lacy and Unknown was: Hugh de Lacy [f], Lord of Ludlow, Earl of Meath, b abt 1138, d 1186. He md  Rohese de Monmouth abt 1163, daughter of Baderon of Monmouth and Rohese de Clare; and  Rose o'Conor aft 1180. Rohese de Monmouth was b abt 1145.
Children of Hugh de Lacy and Rohese de Monmouth were:
Children of Walter de Lacy and Margaret de Braose were:
Children of Gilbert de Lacy and Isabel Bigod were:
a. Little is known of Ilbert de Lacy, aside from the fact that he appears to have held the honour of Pontefract, and that he had a (likely younger) brother, Walter. He is believed to have come into England at the time of the conquest, and to have been dead by the end of the reign of Willam Rufus, at which time his son, Robert, had succeeded to his estates.
b. Robert de Lacy is evidently the first member of the Lacy family to have founded a monastery, that of the Cluniac priory of St. John, Pontefract, sometime during the reign of William I, and also is believed by some to have been responsible for the building of the Lacy castle at Clitheroe. Robert, along with his son Ilbert II, were banished from their English lands around 1114. Robert de Lacy and his wife, Matilda left three known children, a daughter, Aubrey/Albreda, and two sons, Ilbert II and Henry, although there was likely another son, Robert. The elder Robert was dead by 1129, when Robert de Lisoures paid for permission to marry his daughter, Aubrey (Albreda). Ilbert II evidently died without heirs, as he was succeeded by his brother Henry, who also left no heirs.
c. Albreda (or Aubrey) de Lacy became her father's sole heir, and through their daughter, Albreda de Lisoures, the Lacy line was continued by her son, John de Lacy, Constable of Chester.
d. Walter de Lacy, the younger brother of Ilbert, held the honour of Weobley in Herefordshire, and by his wife Ermeline, left sons Roger, who "rebelled and was banished from England", Hugh, and Walter, as well as daughters, Emma and Ermeline. Walter became an abbot, and Hugh died s.p. Ermeline is presumed to have died without male heirs, thus Emma de Lacy became her father's heir. The identity of her husband has never been discovered, but their son, Gilbert took his mother's name, and as had occurred with the line of his brother Ilbert, Walter's line was continued by a female heir.
e. Gilbert, son of an unknown father and the heiress Emma de Lacy, took his mother's name, and recovered the family's lands from Henry II.
f. He was granted Meath in Ireland. By his first wife, Roese/Rohese de Monmouth, he had two sons, Walter and Hugh, as well as a daughter Elayne, who married Robert de Beaufo. He secondly married Rose, the daughter of Roderic o'Connor, King of Connaught, for which he was recalled to England in 1181 for marrying without leave, and by 1182 he was back in Ireland. By this second marriage he had a son William de Lacy. Additional children assigned to him are a son, Gilbert, and two daughters, one who married Geoffrey de Marisco/Marsh, and one who married William Fitz Alan, but by which of his wives is unclear. It is also known that his second wife, Rose o'Connor, had at least two other sons, Thomas and Henry, who's surnames are shown as Blund. As her known son by Hugh de Lacy, William, was sometimes called Le Blund, it is possible that Thomas and Henry were sons by her marriage to Hugh de Lacy.
g. Walter de Lacy was the eldest son of Hugh and his first wife, Rohese de Monmouth. He lost possession of his Irish lands in 1210, but by 1213, they had been restored to him, and was, after that time, in the favor of King John. He is said to have died "blind and infirm" early in 1241.
Weis AR: Line 54[29-30], Line 70[29-30], Line 75A, Line 98 Line 177A[7-8]; SGM: Dave Utzinger and Gordon Fisher [ref: The Lacy Family in England and Normandy, 1066-1194, by W. E. Wightman], Tim Powys-Lybbe [ref: British Dictionary of National Biography].
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