Wiki:
In casting the 1971 film version of Fiddler on the Roof, director Norman Jewison and his production team sought an actor other than Zero Mostel for the lead role. This decision was a controversial one, as Mostel had made the role famous in the long-running Broadway musical and wanted to star in the film. But Jewison and his team felt Mostel would eclipse the character with his larger-than-life personality. Jewison flew to London in February 1968 to see Topol perform as Tevye during his last week with the London production, and chose him over Danny Kaye, Herschel Bernardi, Rod Steiger, Danny Thomas, Walter Matthau, Richard Burton, and Frank Sinatra, who had also expressed interest in the part.
Then 36 years old, Topol was made to look 20 years older and 30 pounds (14 kg) heavier with makeup and costuming.
Frank Sinatra as Tevye?! Can you imagine that LOL!
RIP Topol.