Who commanded a destroyer flotilla

What rank normally commanded a World War II destroyer flotilla?

Usually a captain, with individual destroyers commonly commanded by commanders or lieutenant commanders.

The flotilla's senior officer held a different role from the commanding officers of its individual destroyers. A captain normally led the flotilla, although a commander could sometimes hold the position. Individual ships were commonly commanded by commanders or lieutenant commanders. The rank structure gave the formation commander clear seniority over the officers responsible for each destroyer.