My original question was:
Only four players have ever achieved this. Who are they & what feat is it?
Q1) Is it a bowling feat? No.
Q2) Cowdrey, Miandad, Greenidge, Stewart all scored centuries in their 100th Test? No
Q3) Is it a batting feat? Yes
Q4) Is it a test batting feat? Yes
Q5) Warne,Vaas, Chauhan and Kumble who are the only players to reach 2000 runs without making a century? No
Q6) Trumper, Macartney, Bradman, Majid Khan who are the only batsman to make centuries before lunch on the first day? No
Q7) Do any of their names rhyme with Meryl Streep? No
Q8) Can the feat be realistically achieved in a single match? No (impossible actually)