Who was the first player to ever score a half-century as a number eleven batsman on debut?

Question

Answer 1

Ashton Agar

On debut, he scored 98 runs from 101 balls batting eleventh in Australia's first innings, breaking several Test records, including first player to ever score a half-century as a number eleven batsman on debut, highest score by a number eleven batsman, and, with Phillip Hughes, highest partnership (163 runs) for the tenth wicket.