Richard de Clare, 5th Earl of Hertford, 6th Earl of Gloucester, was born 4 August 1222 to Gilbert de Clare, 5th Earl of Hertford (1180-1230) and Isabel Marshal (1200-1240) and died 15 July 1262 of unspecified causes. He married Megotta de Burgh . He married Maud de Lacy, Countess of Lincoln (1223-c1287) 25 January 1238 JL .
Children
| Name | Birth | Death | Joined with |
| Isabel de Clare (c1240-1271) | 1240 | Guglielmo VII del Monferrato (c1240-1292) | |
| Gilbert de Clare, 7th Earl of Hertford (1243-1295) | 2 September 1243 Christchurch, Hampshire, England, United Kingdom | 7 December 1295 Monmouth, Wales, United Kingdom | Alice de Lusignan (aft1236-1290) Joan of Acre (1272-1307) |
| Thomas de Clare (1245-1287) | 1245 | 29 August 1287 | Juliana FitzGerald (c1263-1300) |
| Bogo de Clare (1248-1294) | |||
| Margaret de Clare (1250-1312) | |||
| Rose de Clare (1252-1317) | 17 October 1252 Tonbridge, Kent, England, United Kingdom | 1317 | Roger de Mowbray, 1st Baron Mowbray (1254-1297) |
| Eglentina de Clare (?-1257) | |||
Footnotes (including sources)
| ‡ General |