song-yuan dynastic marriage

Jun 2013
recently I came across a reference that song emperor gong (zhu xian) married a member of the borjigin clan.

two questions: what was her name, if known?

how, specifically was she related to khubilai khan, or any other of his relatives? (ie: her lineage)

May 2009
"Lady Borjigin" is the only name that seems to come up. Not sure how she was related to Khubilai. Some sources say she was his daughter, other sources say she was just an honorary princess. I'm guessing she was Khubilai's daughter and was presented to Zhu Xian after his surrender in the same way Genghis Khan often gave his daughters in marriage to his vassals. Zhu Xian was certainly important enough to merit a princess of the blood.