Who was the most powerful Samurai Clan during the Edo Age of Japan?

Minamoto

The First Warrior Government (The Kamakura Shogunate, 1185–1333) By the late eleventh century, the Minamoto (also known as Genji) clan was recognized as the most powerful military clan in the northeastern region of Japan, having defeated several other powerful local groups.

lying without the limits of the several states; and may permit them, at such times, and in such manner as it

a change of venue is the legal term for moving a trial to a new location. a change of venue request because venue is improper means that the removing defendant believes that the case may not be in that venue because it is improper under procedural rules.