List of peers 1250–1259

Peerage of England

 * Earl of Surrey (1088)||John de Warenne, 6th Earl of Surrey||1240||1304||
 * rowspan="2"|Earl of Warwick (1088)||Margaret de Newburg, 7th Countess of Warwick||1242||1253||Died
 * William Maudit, 8th Earl of Warwick||1253||1267||
 * Earl of Leicester (1107)||Simon de Montfort, 6th Earl of Leicester||1218||1265||
 * Earl of Gloucester (1122)||Richard de Clare, 6th Earl of Gloucester||1230||1262||5th Earl of Hertford
 * Earl of Arundel (1138)||John FitzAlan, 6th Earl of Arundel||1243||1267||
 * rowspan="2"|Earl of Derby (1138)||William de Ferrers, 5th Earl of Derby||1247||1254||Died
 * Robert de Ferrers, 6th Earl of Derby||1254||1279||
 * Earl of Norfolk (1140)||Roger Bigod, 4th Earl of Norfolk||1225||1270||
 * Earl of Devon (1141)||Baldwin de Redvers, 7th Earl of Devon||1245||1262||
 * Earl of Oxford (1142)||Hugh de Vere, 4th Earl of Oxford||1221||1263||
 * Earl of Salisbury (1145)||Ela of Salisbury, 3rd Countess of Salisbury||1196||1261||
 * Earl of Hereford (1199)||Humphrey de Bohun, 2nd Earl of Hereford||1220||1275||1st Earl of Essex (1239)
 * Earl of Winchester (1207)||Roger de Quincy, 2nd Earl of Winchester||1219||1264||
 * Earl of Lincoln (1217)||Margaret de Quincy, Countess of Lincoln||1232||1266||
 * Earl of Cornwall (1225)||Richard, 1st Earl of Cornwall||1225||1272||
 * Earl of Richmond (1241)||Peter of Savoy, 1st Earl of Richmond||1241||1268||
 * Earl of Pembroke (1247)||William de Valence, 1st Earl of Pembroke||1247||1296||
 * Earl of Chester (1253)||Edward, Earl of Chester||1253||1272||New creation
 * Earl of Oxford (1142)||Hugh de Vere, 4th Earl of Oxford||1221||1263||
 * Earl of Salisbury (1145)||Ela of Salisbury, 3rd Countess of Salisbury||1196||1261||
 * Earl of Hereford (1199)||Humphrey de Bohun, 2nd Earl of Hereford||1220||1275||1st Earl of Essex (1239)
 * Earl of Winchester (1207)||Roger de Quincy, 2nd Earl of Winchester||1219||1264||
 * Earl of Lincoln (1217)||Margaret de Quincy, Countess of Lincoln||1232||1266||
 * Earl of Cornwall (1225)||Richard, 1st Earl of Cornwall||1225||1272||
 * Earl of Richmond (1241)||Peter of Savoy, 1st Earl of Richmond||1241||1268||
 * Earl of Pembroke (1247)||William de Valence, 1st Earl of Pembroke||1247||1296||
 * Earl of Chester (1253)||Edward, Earl of Chester||1253||1272||New creation
 * Earl of Lincoln (1217)||Margaret de Quincy, Countess of Lincoln||1232||1266||
 * Earl of Cornwall (1225)||Richard, 1st Earl of Cornwall||1225||1272||
 * Earl of Richmond (1241)||Peter of Savoy, 1st Earl of Richmond||1241||1268||
 * Earl of Pembroke (1247)||William de Valence, 1st Earl of Pembroke||1247||1296||
 * Earl of Chester (1253)||Edward, Earl of Chester||1253||1272||New creation
 * Earl of Pembroke (1247)||William de Valence, 1st Earl of Pembroke||1247||1296||
 * Earl of Chester (1253)||Edward, Earl of Chester||1253||1272||New creation
 * Earl of Chester (1253)||Edward, Earl of Chester||1253||1272||New creation
 * Earl of Chester (1253)||Edward, Earl of Chester||1253||1272||New creation

Peerage of Scotland

 * Earl of Mar (1114)||Uilleam, Earl of Mar||Abt. 1240||1281||
 * Earl of Dunbar (1115)||Patrick III, Earl of Dunbar||1248||1289||
 * Earl of Angus (1115)||Gilbert de Umfraville, Earl of Angus||1246||1307||
 * rowspan=2|Earl of Atholl (1115)||Forbhlaith, Countess of Atholl||1241||Abt. 1250||Died
 * Ada, Countess of Atholl||Abt. 1250||1264||
 * Earl of Buchan (1115)||Alexander Comyn, Earl of Buchan||Abt. 1243||1289||
 * Earl of Strathearn (1115)||Maol Íosa II, Earl of Strathearn||1245||1271||
 * Earl of Fife (1129)||Máel Coluim II, Earl of Fife||1228||1266||
 * rowspan=2|Earl of Menteith (1160)||Isabella, Countess of Menteith||Abt. 1230||1258||Died
 * Mary I, Countess of Menteith||1258||1295||
 * Earl of Lennox (1184)||Maol Domhnaich, Earl of Lennox||1220||1260||
 * rowspan=3|Earl of Carrick (1184)||Donnchadh, Earl of Carrick||1186||1250||Died
 * Niall, Earl of Carrick||1250||1256||Died
 * Marjorie, Countess of Carrick||1256||1292||
 * rowspan=2|Earl of Ross (1215)||Fearchar, Earl of Ross||1215||1251||Died
 * Uilleam I, Earl of Ross||1251||1274||
 * Earl of Sutherland (1235)||William de Moravia, 2nd Earl of Sutherland||1248||1307||
 * }
 * Mary I, Countess of Menteith||1258||1295||
 * Earl of Lennox (1184)||Maol Domhnaich, Earl of Lennox||1220||1260||
 * rowspan=3|Earl of Carrick (1184)||Donnchadh, Earl of Carrick||1186||1250||Died
 * Niall, Earl of Carrick||1250||1256||Died
 * Marjorie, Countess of Carrick||1256||1292||
 * rowspan=2|Earl of Ross (1215)||Fearchar, Earl of Ross||1215||1251||Died
 * Uilleam I, Earl of Ross||1251||1274||
 * Earl of Sutherland (1235)||William de Moravia, 2nd Earl of Sutherland||1248||1307||
 * }
 * rowspan=2|Earl of Ross (1215)||Fearchar, Earl of Ross||1215||1251||Died
 * Uilleam I, Earl of Ross||1251||1274||
 * Earl of Sutherland (1235)||William de Moravia, 2nd Earl of Sutherland||1248||1307||
 * }
 * Earl of Sutherland (1235)||William de Moravia, 2nd Earl of Sutherland||1248||1307||
 * }
 * }
 * }

Peerage of Ireland

 * Baron Athenry (1172)||Meyler de Bermingham||1244||1262||
 * Baron Kingsale (1223)||Patrick de Courcy, 2nd Baron Kingsale||1230||1260||
 * Baron Kerry (1223)||Thomas Fitzmaurice, 1st Baron Kerry||1223||1260||
 * }
 * Baron Kerry (1223)||Thomas Fitzmaurice, 1st Baron Kerry||1223||1260||
 * }
 * }