Born a free man, Peter was in principle (at least) a Danish citizen before he gained Australian citizenship.

Jackson was at one stage a pupil of "The Black Diamond" Jack Dowridge, a Barbadian immigrant who pioneered boxing in Queensland, Australia.

Among Dowridge's other pupils was "Gentleman Jack" John Reid McGowan, a fellow Australian National Boxing Hall of Fame Inductee.

[1][4] Jackson would once again embark on to strange lands after a year in America, leaving that country for Great Britain.

Jackson fought for a 1,000 pounds and the inaugural British Commonwealth title against Jem Smith, winning due to the latter's use of wrestling tactics in the second round.

[3] Jackson's last defense of his Commonwealth title came against his long-time rival and fellow Australian Frank Slavin.

After a frenetic start to the fight, Jackson would gain the upper hand en route to a 10th-round knockout of Slavin.

[6] After a long hiatus in which he only took part in exhibitions, he lost a bout to the powerfully built James J. Jeffries.

[3] A short time after becoming the first black heavyweight champion of the world in 1908, "The Galveston Giant" Jack Johnson, made a pilgrimage to Jackson's grave, a measure of the respect in which the man was held not only in Queensland, but in the boxing community worldwide.