Sources conflict on who Alfonso married and when.

Father: , Ferdinand II of León, King of León, b. 1137
Mother: , Urraca of Portugal, b. CIR 1151

Married 15 FEB 1191, Guimaraes ANNULMENT 1198 to , Teresa of Portugal
Child 1: , Fernando, b. AFT 1192
Child 2: , Sancha of Castile, Infanta of Castile, b. AFT 1193
Child 3: , Dulce of Castile, b. 1194

Married 1197, Valladolid Divorce 1209 to , Berengaria of Castile, Queen of Castile
Child 4: , Ferdinand (St.) III of Castile, King of Castile and Leon, b. 1199
Child 5: , Berengaria of Castile, Infanta of Castile, b. CIR 1199
Child 6: , Constanza of Castile, Infanta of Castile, b. 1 MAY 1200
Child 7: , Leonor of Castile, Infanta of Castile, b. 1202
Child 8: de Molina, Alfonse de Castilla, sn de Molina y Mesa, b. CIR 1204