Well i had read about this in my schooldays. I am sure its Dennis Amiss of Australia... if not he maybe the one who scored the first century in a world cup.
DL Amiss scored the first century of ICC World Cup.He has scored 137 runs.
Lala Amarnath - scored 118 in Gymkhana Cricket Ground, Mumbai
He has scored 34,357 in international cricket (15,921 runs in test cricket, 18,426 in one day internationals), 25,396 in first class cricket and 21,999 in list A cricket.
Dennis Amiss scored the first century in the world cup against india
don brodman is the person who got first triple hundred in cricket