出典:Wiktionary
Unknown. Presumably derives from legal principle where the satisfaction of 10 (または at times 12) points legitimated ownership; hence “nine points of the law” (sometimes “eleven points of the law”) constituted close to full ownership.[1] Derived from the early English property system, where the right to possession of property was endorsed by the king in the form of a writ. There were nine traditional writs granted by the King, and each of these nine writs represented the nine basic rights of property possession. These nine writs evolved into the nine original laws defining property ownership, hence the expression "possession is nine points in the law."
Listed in the form “Possession is nine points in the Law.” as a common saying in 1616 by Thomas Draxe, Adages 163.
That condition is prescribed by law.
have a brush with the law
The law took effect on the day it was promulgated.
in violation of the law
We are under the guardianship of the laws.
Law to ourselves, our reason is our law.