Is this match even possible to begin with Urraca, the Queen regnant of Castille-Leon and Edgar are contemporaries.
They're a generation apart (Edgar in 1051, Urraca in 1079). And Urraca gains nothing from the marriage unless Edgar Aetheling actually becomes King.
He will gain something if Urraca becomes the Queen of Castile-Leon which means that he will be the King dejure-uxoris.
Edgar leads a Saxon-centric crusade to Iberia, carves out a fief of his own adjacent to Castille, is widowed early on and marries Queen Urraca.
Someone played too much CK2? Urraca is a good grab early on, regardless of where you're starting in.
Actually, now that I think about it, Edgar Atheling could go on crusade and carve out a kingdom on the peninsula. Perhaps he and a bunch of Saxon men can go south to fight the Umayyads, align themselves with with the king of Leon and Castile, and establish alt-Portugal.
Though I'm not sure how feasible that is.
No Edgar Atheling didn't command the fleet supporting the crusade,because he was invadingI've read somewhere (no idea where now), that Edgar commanded a (the?) fleet on the First Crusade (to the Holy Land). I've never been able to find anything to confirm this, or provide more details.
AFAIK he had no surviving children (any such would have course have had a good claim to the English crown, and one could make an argument that any present-day descendants would have a legitimate claim to replace the Windsors), and may never have married.
Personally as a bit of a lefty I'd love to see the British aristocracy slighted as being descendants of a bunch of piratical freebooters, all their land rights being declared null and void, and the legitimate Anglo-Saxon royal house restored
Unfortunately I tried to trace the succession once, and I believe it devolves through Margaret of Scotland and merges with the current line after a few generations.
I've read somewhere (no idea where now), that Edgar commanded a (the?) fleet on the First Crusade (to the Holy Land). I've never been able to find anything to confirm this, or provide more details.
...
Steven Runciman mentions it on his assessment of the First Crusade. He says a Medieval source claimed that Edgar the Aetheling commanded a ship (or a fleet) together with the Italians, and helped in the conquest of a city southeast of Asia Minor (possibly Antioch, but I can't remember).
The author himself suggests that this source is not credible, and that it was probably a fabrication of some later author to paint Edgar the Aetheling as a pious ruler who participated in the very first Crusade.
Steven Runciman mentions it on his assessment of the First Crusade. He says a Medieval source claimed that Edgar the Aetheling commanded a ship (or a fleet) together with the Italians, and helped in the conquest of a city southeast of Asia Minor (possibly Antioch, but I can't remember).
The author himself suggests that this source is not credible, and that it was probably a fabrication of some later author to paint Edgar the Aetheling as a pious ruler who participated in the very first Crusade.
Another heiress is available - Matilda of Canossa.