Hatsuo Royama was born in Saitama, just north of Tokyo, in 1948. Inspired by a country-wide boom in popularity of celebrity fighters and wrestlers, he traveled to Ikebukuro at the age of 15 and entered Mas Oyama's legendary «Oyama Dojo» where his Kyokushin Karate was being born. Having trained there at the birthplace of Mas Oyama's Kyokushin, Royama was one of a very few of Mas Oyama's students to still be closely affiliated with Mas Oyama's organization from so close to the beginning all the way until Mas Oyama's death in 1994. Royama rose to some notoriety when at the age of 25 he became champion of Kyokushin's 5th All Japan Tournament, and later when he defeated the American, Charles Martin, a giant who stood nearly a foot taller (about 30 cm) than himself, in the 1st World Open Karate Tournament in 1975. This young prodigy of Mas Oyama then went on to a historic finish in that 1st World Open Tournament, when a split-decision was finally broken by the tournament judges in the final match and 1st place was given to Katsuaki Sato, leaving Royama with no choice but to accept 2nd place. The day following the tournament when more than a few fighters entered the hospital for injuries sustained during the competition, Royama attended his usual training. No one who knows Kyokushin Karate today can hardly separate the style from its devastatingly powerful low shin kick. Not everyone knows, however, that it was Royama who made this technique famous. At the early World Tournaments the Japanese would hear the foreigners yell, «Low kick! Low kick!," and since the pronunciation of «R» in Japanese is so similar to «L», it was an honest mistake for them to hear «Ro kick! Ro kick!" instead, believing that even the foreigners had named this technique after the first Japanese fighter to make it famous. After all, it was with Royama that all of Japan had associated the introduction of this bone-breaking technique ever since they'd watched Royama break down Charles Martin in the 1st World Tournament with one destructive low shin kick after another
On the Second World Championship in 1978 Royama leads the Japanese team. But misfortune happened, he could not fully prepare for the competition, but took part in 2nd World Championship anyway, where in the third circle he broke the ribs. From that time Royama went out of «fighters». After the death of Oyama Masutatsu Royama remained in Saytama with 25 dojos and 10000 students and became a curator in former USSR countries and Far East.Since January 2003 Royama Hatsuo is the president of the International Kyokushin-kan karate Federation..