A contemporary inscription refers to Sumyafa' Ashwa' as "viceroy for the kings of Aksum. According to the later Arabic sources, Kaleb retaliated by sending a force of 3,000 men under a relative, but the troops defected and killed their leader, and a second attempt at reigning in the rebellious Abrahah also failed. Later Ethiopian sources state that Kaleb abdicated to live out his years in a monastery and sent his crown to be hung in the Church of the Holy Sepulchre in Jerusalem. While uncertain, it seems to be supported by the die-links between his coins and those of his successor, Alla Amidas. An inscription of Sumyafa' Ashwa' also mentions two kings ("nagaśt") of Aksum, indicating that the two may have co-ruled for a while before Kaleb abdicated in favor of Alla Amidas. Procopius notes that Abrahah later submitted to Kaleb's successor, as supported by the former's inscription in 543 stating Aksum before the territories directly under his control. During his reign, Abrahah repaired the Ma'rib Dam in 543, and received embassies from Persia and Byzantium, including a request to free some bishops who had been imprisoned at Nisibis (according to John of Ephesus's "Life of Simeon"). Abraha ruled until at least 547, sometime after which he was succeeded by his son, Aksum. Aksum (called "Yaksum" in Arabic sources) was perplexingly referred to as "of Ma'afir" ("ḏū maʻāfir"), the southwestern coast of Yemen, in Abrahah's Ma'rib dam inscription, and was succeeded by his brother, Masrūq. Aksumite control in Yemen ended in 570 with the invasion of the elder Sassanid general Vahriz who, according to later legends, famously killed Masrūq with his well-aimed arrow. Later Arabic sources also say that Abrahah constructed a great Church called "al-Qulays" at Sana'a in order to divert pilgrimage from the Ka'bah and have him die in the Year of the Elephant (570) after returning from a failed attack on Mecca (though he is thought to have died before this time). The exact chronology of the early wars are uncertain, as a 525 inscription mentions the death of a King of Ḥimyar, which could refer either to the Ḥimyarite viceroy of Aksum, Sumyafa' Ashwa', or to Yusuf Asar Yathar.