Dhu Nuwas
Around 520, Kaleb of Axum had sent an expedition to Yemen against the Jewish Himyarite king Dhu Nuwas, who was persecuting the Christian community there. Dhu Nuwas was deposed and killed and Kaleb appointed a Christian Himyarite, Esimiphaios ("Sumuafa Ashawa"), as his viceroy. However, around 525 this viceroy was deposed by the Aksumite general Abraha after which the Axumite general declared himself King of the newly formed, independent Himyarite/Axumite Kingdom (not to be mistaken with the Axumite Empire).