Before 15 Aug 1171 [his father] Ferdinand II King Leon (age 34) and [his mother] Urraca Burgundy Queen Consort Leon (age 23) were married. She by marriage Queen Consort Leon. She the daughter of [his grandfather] Afonso "Conqueror Founder Great" I King Portugal (age 62) and [his grandmother] Malfada Savoy Queen Consort Portugal. He the son of [his grandfather] Alfonso VII King Castile VII King Leon and [his grandmother] Berenguela Barcelona Queen Consort Castile and Leon. They were half second cousins.

On 15 Aug 1171 Alfonso IX King Leon was born to Ferdinand II King Leon (age 34) and Urraca Burgundy Queen Consort Leon (age 23). Coefficient of inbreeding 2.00%.

In 1191 [his daughter] Sancha Ivrea Queen Consort Castile was born to Alfonso IX King Leon (age 19) and [his wife] Theresa of Portugal Queen Consort Leon (age 15). Coefficient of inbreeding 8.34%.

In 1191 Alfonso IX King Leon (age 19) and Theresa of Portugal Queen Consort Leon (age 15) were married. She by marriage Queen Consort Leon. She the daughter of Sancho "Populator" I King Portugal (age 36) and Dulce Barcelona Queen Consort Portugal. He the son of Ferdinand II King Leon and Urraca Burgundy Queen Consort Leon (age 43). They were first cousins.

Around 1192 [his son] Ferdinand Ivrea was born to Alfonso IX King Leon (age 20) and [his wife] Theresa of Portugal Queen Consort Leon (age 16). Coefficient of inbreeding 8.34%.

Around 1193 [his daughter] Dulce Ivrea was born to Alfonso IX King Leon (age 21) and [his wife] Theresa of Portugal Queen Consort Leon (age 17). Coefficient of inbreeding 8.34%.

In 1197 Alfonso IX King Leon (age 25) and Berengaria Ivrea I Queen Castile (age 18) were married. She by marriage Queen Consort Leon. She the daughter of Alfonso VIII King Castile (age 41) and Eleanor Plantagenet Queen Consort Castile (age 35). He the son of Ferdinand II King Leon and Urraca Burgundy Queen Consort Leon (age 49). They were first cousin once removed. She a granddaughter of King Henry "Curtmantle" II of England.

In 1199 [his son] Ferdinand III King Castile III King Leon was born to Alfonso IX King Leon (age 27) and [his wife] Berengaria Ivrea I Queen Castile (age 20). He a great grandson of King Henry "Curtmantle" II of England. Coefficient of inbreeding 3.56%.

23 May 1200 King Louis VIII of France (age 12) and [his sister-in-law] Blanche Ivrea Queen Consort France (age 12) were married. She the daughter of [his father-in-law] Alfonso VIII King Castile (age 44) and [his mother-in-law] Eleanor Plantagenet Queen Consort Castile (age 38). He the son of King Philip II of France (age 34) and Isabelle Flanders Queen Consort France. They were third cousins. He a great x 3 grandson of King William "Conqueror" I of England. She a granddaughter of King Henry "Curtmantle" II of England.

In 1204 [his daughter] Beregaria Ivrea was born to Alfonso IX King Leon (age 32) and [his wife] Berengaria Ivrea I Queen Castile (age 25). She a great granddaughter of King Henry "Curtmantle" II of England. Coefficient of inbreeding 3.56%.

In 1206 [his brother-in-law] Alfonso "Fat" II King Portugal (age 20) and [his sister-in-law] Urraca Ivrea Queen Consort Portugal (age 18) were married. She the daughter of [his father-in-law] Alfonso VIII King Castile (age 50) and [his mother-in-law] Eleanor Plantagenet Queen Consort Castile (age 44). He the son of [his uncle] Sancho "Populator" I King Portugal (age 51) and Dulce Barcelona Queen Consort Portugal. They were second cousin once removed. She a granddaughter of King Henry "Curtmantle" II of England.

In 1211 [his mother] Urraca Burgundy Queen Consort Leon (age 63) died.

On 26 Mar 1211 [his uncle] Sancho "Populator" I King Portugal (age 56) died. On 26 Mar 1211 His son [his brother-in-law] Alfonso "Fat" II King Portugal (age 25) succeeded II King Portugal. [his sister-in-law] Urraca Ivrea Queen Consort Portugal (age 23) by marriage Queen Consort Portugal.

In 1214 King Valdemar II of Denmark (age 43) and [his sister-in-law] Berengaria Burgundy Queen Consort Denmark (age 16) were married. She by marriage Queen Consort Denmark. The difference in their ages was 27 years. She the daughter of [his uncle] Sancho "Populator" I King Portugal and Dulce Barcelona Queen Consort Portugal. He the son of Valdemar "Great" I King Denmark and Sophia of Minsk.

In 1215 [his future son-in-law] Henry I King Castile (age 10) and [his sister-in-law] Mafalda Burgundy Queen Consort Castile (age 19) were married. She by marriage Queen Consort Castile. She the daughter of [his uncle] Sancho "Populator" I King Portugal and Dulce Barcelona Queen Consort Portugal. He the son of [his father-in-law] Alfonso VIII King Castile and [his mother-in-law] Eleanor Plantagenet Queen Consort Castile. They were second cousin once removed. He a grandson of King Henry "Curtmantle" II of England.

In 1216 [his son-in-law] Henry I King Castile (age 11) and [his daughter] Sancha Ivrea Queen Consort Castile (age 25) were married. She by marriage Queen Consort Castile. She the daughter of Alfonso IX King Leon (age 44) and [his wife] Theresa of Portugal Queen Consort Leon (age 40). He the son of [his father-in-law] Alfonso VIII King Castile and [his mother-in-law] Eleanor Plantagenet Queen Consort Castile. They were second cousins. He a grandson of King Henry "Curtmantle" II of England.

On 30 Nov 1219 [his son] Ferdinand III King Castile III King Leon (age 20) and [his daughter-in-law] Elisabeth Hohenstaufen Queen Consort Castile Queen Consort Leon (age 14) were married in Burgos [Map]. She by marriage Queen Consort Castile, Queen Consort Leon. He the son of Alfonso IX King Leon (age 48) and [his wife] Berengaria Ivrea I Queen Castile (age 40). They were fourth cousins. He a great grandson of King Henry "Curtmantle" II of England.

On 03 Nov 1220 [his sister-in-law] Urraca Ivrea Queen Consort Portugal (age 33) died.

On 27 Mar 1221 [his sister-in-law] Berengaria Burgundy Queen Consort Denmark (age 23) died.

On 25 Mar 1223 [his brother-in-law] Alfonso "Fat" II King Portugal (age 37) died at Coimbra. His son Sancho "Pious" II King Portugal (age 13) succeeded II King Portugal.

On 14 Jul 1223 King Philip II of France (age 57) died. His son King Louis VIII of France (age 35) succeeded VIII King France: Capet. [his sister-in-law] Blanche Ivrea Queen Consort France (age 35) by marriage Queen Consort of France.

On 24 Sep 1230 Alfonso IX King Leon (age 59) died. His son [his son] Ferdinand III King Castile III King Leon (age 31) succeeded III King Leon.

On 08 Nov 1246 [his former wife] Berengaria Ivrea I Queen Castile (age 67) died.

On 18 Jun 1250 [his former wife] Theresa of Portugal Queen Consort Leon (age 74) died.

[his daughter] Maria Ivrea was born to Alfonso IX King Leon and Theresa of Portugal Queen Consort Leon. Coefficient of inbreeding 8.34%.