WI: Alfonso IX of Leon marries Eleanor, Fairmaid of Brittany

I was thinking if it is possible for the Fairmaid of Brittany to be married to Alfonso IX, from what I heard Eleanor was supposed to marry Saladin's brother and the Duke of Austria, I think Alfonso will gain something in marrying the Fairmaid, he will have spare heirs with no doubtful legitimacy.

This match is similar to Elizabeth of York marrying the Duke of Beja.

Marrying her to the Leonese monarch will make her as weak as a heiress of Arthur making her sons very foreign to the English and French eyes..
 
Alfonso IX of Leon (b.1171: d.1230) m. Theresa of Portugal (b.1178: d.1230) (a) -annulled in 1200-, Eleanor, Fair Maid of Brittany (b.1184: d.1241) (b)
1a) Ferdinand of Leon (b.1192: d.1214)

2a) Sancha of Leon (b.1193: d.1240)

3a) Dulce of Leon (b.1194: d.1248)

4b) Saint Constance of Leon (b.1202) - nun

5b) Alfonso X of Leon (b.1205: d.1270) m. Agnes of Merania (b.1215: d.1263) (a)
1a) Ferdinand III of Leon (b.1226)

2a) Beatrice of Leon (b.1228: d.1229)

3a) Alfonso of Leon (b.1233: d.1238)
6b) Diego, Duke of Brittany (b.1206: d.1259) m. Isabelle of France (b.1224: d.1270) (a)
1a) Beatrice of Brittany (b.1248: d.1249)

2a) Margaret of Brittany (b.1253)

3a) Arthur, Duke of Brittany (b.1258)
7b) Margaret of Leon (b.1210: d.1212)

8b) Eleanor of Leon (b.1210: d.1210)

9b) Matilda of Leon (b.1215: d.1242) m. Henry III of England (b.1207: d.1272)
1a) Miscarriage (c.1234)

2a) Stillborn Boy (c.1235)

3a) Stillborn Boy (c.1237)

4a) Stillborn Girl (c.1238)

5a) Eleanor of England (b.1240)

6a) Stillborn Boy (c.1242)
7b) Urraca of Leon (b.1222: d.1264) m. Rudolf I of Germany (b.1218: d.1291) (a)
1a) Margaret of Germany (b.1245)

2a) Albert I of Germany (b.1246)

3a) Agnes of Germany (b.1249)

4a) Hedwig of Germany (b.1253)

5a) Stillborn Boy (c.1255)

6a) Otto of Germany (b.1257)

7a) Clementia of Germany (b.1260)
 
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