Jonathan Joestar (Japanese: ジョナサン・ジョースター, Hepburn: Jonasan Jōsutā) is a fictional character in the Japanese manga series JoJo's Bizarre Adventure, written and illustrated by Hirohiko Araki. Jonathan is the main protagonist of the series' first story arc, Phantom Blood. In late 19th-century England, the young son of a wealthy landowner, Jonathan Joestar, meets his new adopted brother Dio Brando, who loathes him and plans to usurp him as heir to the Joestar family. When Dio's attempts are thwarted, he transforms himself into a vampire with the use of an ancient Stone Mask and destroys the Joestar estate. Jonathan embarks on a journey, meets new allies and masters the Hamon (波紋, "Ripple") martial arts technique to stop Dio, who has made world domination his new goal.