Boniface I de Montferrat & Margareta of Hungary 
Boniface I and Margareta of were married in a religious ceremony in May 1204.1 They had a son named Demetrius de Montferrat of.
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Children
Demetrius de Montferrat of Thessalonica
Demetrius de Montferrat of was born in 1205. He died at the age of 22 in 1227.
1 Foundation for Medieval Genealogy; http://fmg.ac/; Medieval Lands @ Monferrato, Saluzzo, Chapter 1
2 Leo van de Pas: Genealogics Website @ http://www.genealogics.org/getperson.php?personID=I00020752&tree=LEO
2 Leo van de Pas: Genealogics Website @ http://www.genealogics.org/getperson.php?personID=I00020752&tree=LEO