Nicasuis was born september 23, 1610, in Arnheim. He studied at Leyden and the Univerity of Orleans where he graduated "with the cap," a Doctor of Law, as his father had done before him.

He married 1st, Cornelia Meulmans, daughter of Peter Meulmans and Anna Marschalk, and came to New Netherlands a widower with five children.

Nicasius was one of the original Proprietors of New Utrecht, and in 1657 he built there the first stone house in the town, which "also had a tile roof," and was standing until 1850, when it was destroyed.

Arms of Nicasius de Sille, of Arnheim, Netherlands, who came to New Netherlands in 1653 to serve as First Councillor to Peter Stuyvesant.

ARMS- Sable a saltire argent; in the center chief a mullet of six points Or; in the flanks and base a curry-comb argent. CREST- upon a wreath of the colors (sable and argent) two arms in armour embowed, each grasping in the gauntleted hand a broad sword hilted and pommeled or, tilted outwardly, all proper.