Examples from the Web for thereon
Grimston bore “Silver a fesse sable and thereon three molets silver pierced gules.”
From hence to the Neth is about two miles and a halfe, thereon come shiplets almost to the towne of Neth from the Sauerne.Chronicles (1 of 6): The Description of Britaine|Raphaell Holinshed
But the English wavered, seeing his line advance, and thereon Douglas halted his men, lest Randolph should lose renown.
Thereon each manufacturer looks up the list of papers in the threatened state with which he has the contracts described above.The Great American Fraud|Samuel Hopkins Adams
Consul also pushed a chair toward me, but I sat not thereon, but threw myself upon my knees in a corner.The Amber Witch|Wilhelm Meinhold