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On 23rd January 1302 [his father] Ferdinand IV King Castile IV King Leon and [his mother] Constance Burgundy Queen Consort Castile Queen Consort Leon were married. She by marriage Queen Consort Castile, Queen Consort Leon. She the daughter of [his grandfather] Denis I King Portugal and [his grandmother] Elisabeth Barcelona Queen Consort Portugal. He the son of [his grandfather] Sancho IV King Castile IV King Leon and [his grandmother] Maria Molina Queen Consort Castile Queen Consort Leon.
On 13th August 1311 Alfonso "Avenger" XI King Castile was born to [his father] Ferdinand IV King Castile IV King Leon and [his mother] Constance Burgundy Queen Consort Castile Queen Consort Leon.
On 7th September 1312 [his father] Ferdinand IV King Castile IV King Leon died. Alfonso "Avenger" XI King Castile succeeded XI King Castile.
On 18th November 1313 [his mother] Constance Burgundy Queen Consort Castile Queen Consort Leon died.
In 1325 Alfonso "Avenger" XI King Castile and Constanza Manuel Queen Consort Castile were married. She by marriage Queen Consort Castile. The marriage was annulled in 1327; there was no issue from the marriage. He the son of Ferdinand IV King Castile IV King Leon and Constance Burgundy Queen Consort Castile Queen Consort Leon.
In 1325 the marriage of Eleanor of Woodstock Plantagenet to Alfonso "Avenger" XI King Castile was discussed but not pursued.
In 1328 Alfonso "Avenger" XI King Castile and Maria Burgundy Queen Consort Castile were married. She by marriage Queen Consort Castile. She the daughter of Alfonso "Brave" IV King Portugal and Beatrice Ivrea Queen Consort Portugal. He the son of Ferdinand IV King Castile IV King Leon and Constance Burgundy Queen Consort Castile Queen Consort Leon.
In 1331 [his illegitimate son] Sancho Alfonso Ivrea was born illegitimately to Alfonso "Avenger" XI King Castile and Eleanor Guzman. He married Beatrice Burgundy, daughter of Peter I King Portugal and Inês Castro, and had issue.
In 1332 [his son] Ferdinand Ivrea was born to Alfonso "Avenger" XI King Castile and [his wife] Maria Burgundy Queen Consort Castile. He died aged one in 1333.
In 1333 [his son] Ferdinand Ivrea died.
In 1334 [his illegitimate son] Pedro Alfonso Ivrea was born illegitimately to Alfonso "Avenger" XI King Castile and Eleanor Guzman. He died aged four in 1338.
On 13th January 1334 [his illegitimate son] Henry "Fratricide" II King Castile was born illegitimately to Alfonso "Avenger" XI King Castile and Eleanor Guzman. He was one of twins. He married before 24th August 1358 Juana Manuel Queen of Castile and had issue.
On 13th January 1334 [his illegitimate son] Fadrique Alfonso Ivrea was born illegitimately to Alfonso "Avenger" XI King Castile and Eleanor Guzman at Seville.
On 30th August 1334 [his son] Peter "Cruel" I King Castile was born to Alfonso "Avenger" XI King Castile and [his wife] Maria Burgundy Queen Consort Castile. He married July 1353 Blanche Bourbon Queen Consort Castile, daughter of Peter Bourbon Duke Bourbon and Isabella Valois Duchess Bourbon.
In 1336 [his illegitimate son] Fernando Ivrea was born illegitimately to Alfonso "Avenger" XI King Castile and Eleanor Guzman.
In 1337 [his illegitimate son] Tello Ivrea was born illegitimately to Alfonso "Avenger" XI King Castile and Eleanor Guzman.
In 1338 [his illegitimate son] Pedro Alfonso Ivrea died.
On 24th August 1340 [his brother-in-law] Peter I King Portugal and [his wife] Constanza Manuel Queen Consort Castile were married. She by marriage Queen Consort Portugal. He the son of [his uncle] Alfonso "Brave" IV King Portugal and [his aunt] Beatrice Ivrea Queen Consort Portugal.
In 1341 [his illegitimate son] Juan Ivrea was born illegitimately to Alfonso "Avenger" XI King Castile and Eleanor Guzman.
In 1342 [his illegitimate daughter] Juana Ivrea was born illegitimately to Alfonso "Avenger" XI King Castile and Eleanor Guzman.
In 1343 [his illegitimate son] Sancho Ivrea was born illegitimately to Alfonso "Avenger" XI King Castile and Eleanor Guzman.
In 1345 [his illegitimate son] Pedro Ivrea was born illegitimately to Alfonso "Avenger" XI King Castile and Eleanor Guzman.
On 15th November 1347 Peter IV King Aragon and [his sister-in-law] Eleanor Burgundy Queen Consort Aragon were married. She by marriage Queen Consort Aragon. She the daughter of [his uncle] Alfonso "Brave" IV King Portugal and [his aunt] Beatrice Ivrea Queen Consort Portugal. He the son of Alfonso IV King Aragon and Teresa Enteca Queen Consort Aragon.
On 30th October 1348 [his sister-in-law] Eleanor Burgundy Queen Consort Aragon died of plague. See Masearo, Condes de Barcelona, Volume 2, p. 274.
On 13th January 1349 [his wife] Constanza Manuel Queen Consort Castile died.
In or before 1350 [his brother-in-law] Peter I King Portugal and Inês Castro were married. She by marriage Queen Consort Portugal. There is some uncertainty as to whether they were married. He announced their marriage in 1357 after he succeeded, and after her death, thereby ensuring their children were legitimate. He the son of [his uncle] Alfonso "Brave" IV King Portugal and [his aunt] Beatrice Ivrea Queen Consort Portugal.
Around 1350 [his illegitimate son] Fernando Ivrea died.
On 26th March 1350 Alfonso "Avenger" XI King Castile died of plague. [his son] Peter "Cruel" I King Castile succeeded I King Castile.
On 18th January 1357 [his former wife] Maria Burgundy Queen Consort Castile died.