[Retroreuss]

What ninja do you consider the strongest in the history of the Leaf Village in Naruto?

In my opinion, it's Hiruzen Sarutobi. He was the Third Hokage, and was titled "The Professor" because of his vast array of jutsu. Plus, at the old age of 75 he was able to fight and defeat two Hokages at the same time, as well as paralyze both arms of one of the legendary Sannin. And if he was that strong when he was that old, one could only imagine how powerful he was in his prime.