| | Sex | Birth place | Death place | Father | Mother | Joined with |
|---|
| Alfonso III of Aragon (1265-1291) | M | Valencia | | Pedro III de Aragón (1240-1285) | Constance of Sicily (1249-1302) | |
| Alfonso Arzabe (-) | M | Cochabamba, Bolivia | Cochabamba, Bolivia | | | |
| Alfonso V de León (994-1028) | M | | | Bermudo II de Léon (c953-999) | Elvira García de Castilla (965-1017) | Elvira Mendes (c996-1022) + Urraca of Pamplona (?-?) |
| Alfonso Calice (2008-) | M | London, England, United Kingdom | | Mathias Calice (1969-) | Stefania Lucchesi Palli (1974-) | |
| Alfonso of Orléans (1886-1975) | M | Madrid, Spain | Sanlúcar de Barrameda, Spain | Antonio of Orléans (1866-1930) | Eulalia de Asis de la Piedad de España (1864-1958) | Beatrice von Sachsen-Coburg und Gotha (1884-1966) |
| Alfonso IX, King of León (1171-1230) | M | | | Ferdinand II, King of León (1137-1188) | Urraca of Portugal (1151-1188) | Teresa of Portugal (c1176-1250)+Berenguela of Castile (1180-1246) + Aldonza Martínez de Silva |
| Alfonso VIII, King of Castile (1155-1214) | M | | | Sancho III, King of Castile (1134-1158) | Blanca Garcés of Navarre (aft1133-1156) | Eleanor of England (1162-1214) |
| Alfonso VII, King of León and Castile (1105-1157) | M | | | Raymond de Bourgogne (1059-1107) | Urraca of León and Castile (1079-1126) | Berenguela of Barcelona (1116-1149)+Richeza of Poland (c1140-1185) |
| Alfonso XI of Castile (1311-1350) | M | Salamanca | Gibraltar | Fernando IV of Castile (1285-1312) | Constança of Portugal (1290-1313) | Constance of Peñafiel (aft1315-1345)+Maria of Portugal (1313-1357)+Leonor de Guzmán (1310-1351) |
| Alfonso X of Castile (1221-1284) | M | Toledo, Spain | Seville, Spain | Ferdinand III, King of Castile (1199-1252) | Elisabeth von Staufen (1203-1235) | Violant de Aragón (1236-1301)+Maria de Guzman (?-?) |
| Alfonso Enríquez de Castilla (1354-1429) | M | Guadalcanal | Guadalupe | Fadrique of Castile (1334-1358) | Yonah ibn Gedaliah | Juana de Mendoza |
| Alfonso, Earl of Chester (1273-1284) | M | Bayonne, Basse-Pyrenees, France | Windsor Castle, Windsor, Berkshire, England, United Kingdom | Edward I of England (1239-1307) | Eleanor of Castile (1241-1290) | |
| Alfonso V of Aragon (1396-1458) | M | | | Fernando I of Aragon (1380-1416) | Eleanor de Alburquerque (1374-1435) | Mary of Castile (1401-1458) + Giraldona Carlino (?-?) |
| Alfonso de Vere (c1259-) | M | | | Robert de Vere, 5th Earl of Oxford (c1240-1296) | Alice de Sanford (c1240-) | Jane Foliot |
| Alfonso Zurita y de Borbón (1973-) | M | | | Carlos Zurita y Delgado (1943-) | Margarita, Infanta de España (1939-) | |
| Alfonso of Este (1476-1534) | M | Subiaco, Italy | Ferrara, Italy | Ercole I d'Este (1431-1505) | Eleanor of Naples (1450-1493) | Anna Sforza (1476-1497) + Lucrezia Borgia (1480-1519) + Laura Dianti (c1507-1573) |
| Alfonso d'Este (1527-1587) | M | Ferrara, Italy | Ferrara, Italy | Alfonso of Este (1476-1534) | Laura Dianti (c1507-1573) | Giulia Feltria della Rovere (1531-1563) + Violante Signa (1546-1609) |
| Alfonso III d'Este (1591-1644) | M | Ferrara, Italy | Castelnuovo di Garfagnana, Toscana, Italy | Cesare d'Este (1562-1628) | Virginia de' Medici (1568-1615) | Isabelle de Savoie (1591-1626) |
| Alfonso IV d'Este (1634-1662) | M | Ducal Palace, Modena, Italy | Ducal Palace, Modena, Italy | Francesco d'Este (1610-1658) | Maria Caterina Farnese (1615-1646) | Laura Martinozzi (1639-1687) |
| Alfonso de Aragón (1180-1209) | M | Barcelona | | Alfonso II of Aragon (1157-1196) | Sancha of Castile (1155-1208) | Garsende de Sabran (c1180-c1242) |
| Alfonso, Infante de España (1941-1956) | M | Rome, Italy | Cascais, Lisboa Region, Portugal | Juan de Borbón y Battenberg, Conde de Barcelona (1913-1993) | María Mercedes di Borbone delle Due Sicilie (1910-2000) | |
| Alfonso XIII de España (1886-1941) | M | Madrid, Spain | Rome, Italy | Alfonso XII de España (1857-1885) | Maria Christina von Österreich (1858-1929) | Victoria Eugenie of Battenberg (1887-1969) |
| Alfonso XII de España (1857-1885) | M | Madrid, Spain | El Pardo, Spain | Francisco de Asís de Borbón (1822-1902) | Isabella II de España (1830-1904) | Mercedes of Orléans (1860-1878) + Maria Christina von Österreich (1858-1929) |
| Alfonso de España (1907-1938) | M | Madrid, Spain | Miami, Florida, United States | Alfonso XIII de España (1886-1941) | Victoria Eugenie of Battenberg (1887-1969) | Edelmira Ignacia Adriana Sampredo Ocejo y Robato (1906-1994)+Marta Esther Rocafort y Altazzura (1913-1993) |
| Alfonso of Sicily (c1120-1144) | M | | | Roger II of Sicily (1095-1154) | Elvira of León (c1100-1135) | |
| Alfonso de Molina (1202-1272) | M | | Salamanca | Alfonso IX, King of León (1171-1230) | Berenguela of Castile (1180-1246) | Mafalda de Lara (-1244)+Teresa de Lara (1220-1246)+Mayor de Meneses (1230-aft1264) |
| Alfonso di Borbone delle Due Sicilie (1841-1934) | M | Caserta, Province of Caserta, Campania, Italy | Cannes, France | Ferdinando II di Borbone delle Due Sicilie (1810-1859) | Maria Theresia von Österreich (1816-1867) | Maria Antonietta di Borbone delle Due Sicilie (1851-1938) |
| Alfonso di Borbone delle Due Sicilie (1901-1964) | M | Madrid, Spain | Vienna, Austria | Carlo di Borbone delle Due Sicilie (1870-1949) | María de las Mercedes de España (1880-1904) | Alice di Borbone-Parma (1917-2017) |
| Alfonso I of Aragon and Navarre (c1073-1134) | M | | Fraga | Sancho I of Aragon (c1042-1094) | Félicie de Montdidier (?-1123) | Urraca of León and Castile (1079-1126) |
| Alfonso II of Aragon (1157-1196) | M | Huesca | | Ramon Berenguer IV of Barcelona (1115-1162) | Petronila of Aragon (1136-1173) | Sancha of Castile (1155-1208) |
| Alfonso IV of Aragon (1299-1336) | M | Naples, Metropolitan City of Naples, Campania, Italy | Barcelona, Spain | Jaime II of Aragon (1267-1327) | Blanche of Anjou (1280-1310) | Teresa of Entença (1300-1327) + Leonor of Castile (1307-1359) |
| Alfonso VI of León and Castile (1040-1109) | M | | | Ferdinand of León and Castile (1016-1065) | Sancha de León (c1020-1067) | Agnes of Aquitaine (1052-1078) + Jimena Muñoz (?-?) + Constance de Bourgogne (1046-1093) + Zaida of Seville (c1070-1107) + Bertha Unknown (-1099) + Isabel Unknown (?-?) + Beatrice Unknown (?-?) |
