Euphrosyne Palaiologina

-https://en.wikipedia.org/wiki/Euphrosyne_Palaiologina_(daughter_of_Michael_VIII)

[... In 1266, the Emperor Michael VIII Palaeologus, anxious to make an alliance, gave his daughter Euphrosyne Palaiologina to Nogai as a wife...]

-http://fmg.ac/Projects/MedLands/BYZANTIUM%2012611453.htm#Euphrosyne...

8. EUPHROSYNE [Eirene] Palaiologina. Pachymeres records that "imperator aliam suam filiam…ex pellicle genitam…Euphrosynam" married "principi Noga", in [1266] from the context[163]. Pachymeres refers to the marriage between "Michaele Auguste…filiæ Euphrosynes" and "Nogas"[164]. Her marriage was arranged to confirm the alliance between her father and her future husband.

m (1266) NOGAI Khan of the Golden Horde, son of --- (-killed in battle on the Bug 1293). He was killed in battle by Tokhta Khan[165].