It formed a free city of merchants and prospered through commerce and maritime trade as a port city rivaling Sakai, Hakata, and Ōminato. After passing through the Nagashima Ikkō Ikki sphere, it fell under Oda and Toyotomi rule; after 1601, Honda Tadakatsu developed the castle town and harbor.
Medieval Kuwana's harbor was affected by shifting channels of the Kiso Three Rivers; the coordinate represents the eastern edge of the early-modern castle town near Shichiri Crossing.
Certainty: HighHow far the account above is supported by the cited sources. It does not refer to the precision of the coordinates or the dating.