Louis de Brienne was born circa 1235 to Jean de Brienne (c1170-1237) and Berenguela de León (1204-1237) and died after 1263 of unspecified causes. He married Agnès de Beaumont-au-Maine (c1225-1301) 12 February 1253 JL .
Children
| Name | Birth | Death | Joined with |
| Marie de Brienne (1265-1328) | 1265 | 1328 | Henri III d'Avaugour (1247-1301) |
| Louis de Brienne (-1333) | |||
| Jean de Beaumont (c1255-c1305) | 1255 | 1305 | Jeanne de La Guerche (1250-1290) Marie de Mechelen (1265-1306) |
| Marguerite de Brienne (-1328) | |||
| Isabel de Brienne (-1334) | |||
| Jeanne de Brienne (-1310) | |||
| Henry Beaumont (c1255-1339) | 1255 | 10 March 1340 | Alice Comyn (bef1296-bef1349) |
Footnotes (including sources)
| ‡ General |