[The Saucepan Man]

Third Age? Yes
Is it male? Yes
man? Yes
From Gondor? No
From Rohan? No
Good? Yes (see posts 2937 and 2938)
Lives or lived in Rhovanion at the time of the War of the Ring? Unknown but doubtful.
Beorn? No
Alive during the Great Years? Unknown but doubtful
From Bree? No
From Eriador? No
Man of Dale? No
Is he mentioned in 'The Hobbit'? Yes

Is it "the Master who ruled them" who couldn't say how Gollum came by the Ring? Not that I'm aware of
Does he have a specific name? Nope