How many Britannics?

I read somewhere on Ebay that the Britannic was in service from 1930-1960? I thought the ship never got the chance to see service because it was commissioned for war and was destroyed by that bomb.
Do you know what happened to the Britannic I or was that ship built before the Olympic class came about? I had no idea that there were 3 Britannics.

Jim Stein

Britannic 1 was a sister ship to Germanic both built by H&W interestingly the Germanic survived for 75 years even 2 sinkings.
I'm looking for drawings of either ship.
There were three White Star Line ships with the name Britannic. There was the SS Britannic from 1874, the famous HMHS Britannic from 1916, and the MV Britannic from 1929.