Who said "A man who rules alone is already half-defeated."?

This quote is attributed to Trajan.

A man who rules alone is already half-defeated. - Trajan

"A man who rules alone is already half-defeated."

Trajan Leadership

Emperor Ancient Rome 53–117

"Optimus Princeps"

"I have made the most extensive conquests of any Emperor before me"

"The bravest thing I ever did was continue when I wanted to stop"

"A man must make his own way in this world"

"A leader must be fair and just."

"Integrity is everything."

"One must take responsibility for one's environment."

"In this house, I make the decisions"