Kyriakos or Cyriacus was a ruler of the Nubia

Nubia

Nubia is a region along the Nile river, which is located in northern Sudan and southern Egypt.There were a number of small Nubian kingdoms throughout the Middle Ages, the last of which collapsed in 1504, when Nubia became divided between Egypt and the Sennar sultanate resulting in the Arabization...

n kingdom of Makuria

Makuria

The Kingdom of Makuria was a kingdom located in what is today Northern Sudan and Southern Egypt. It was one of a group of Nubian kingdoms that emerged during the decline of the Aksumite Empire, which it had been part of from approximately 4BC to AD 950...

. While some authorities place his reign between Merkurios

Merkurios of Makuria

Merkurios was ruler of the Nubian kingdom of Makuria. Authorities believe that during his reign Makuria absorbed the Nubian kingdom of Nobatia....

 and Zacharias I

Zacharias I of Makuria

Zacharias I was a ruler of the Nubian kingdom of Makuria.According to Severus of El Ashmunein, Zacharias was the son of his predecessor, Merkurios.1 Severus gives the impression that his reign was brief, for he states that "Zacharias did not choose to become king, but occupied himself with the...

, according to Severus of El Ashmunein

Severus Ibn al-Muqaffa

Severus ibn al-Muqaffaʿ or Severus of El Ashmunein was a Coptic Bishop, author and historian. In Arabic, his name is spelled Sawires ساويرس. Severus is sometimes confused with Abdullah Ibn al-Muqaffa.He was bishop of Hermopolis Magna , in Upper Egypt, around the end of the tenth century...

, Kyriakos succeeded Markos

Markos of Makuria

Markos was ruler of the Nubian kingdom of Makuria. According to Severus of El Ashmunein, Markos ruled for only six months.1Markos was made king by the former king Zacharias after he had deposed Abraham and exiled him to an island in the middle of the Nile...

.

Around 748, Kyriakos marched north into Egypt at the head of an army said to number 100,000 men to free the Patriarch of Alexandria Michael

Pope Michael of Alexandria

Pope Michael I of Alexandria was the Coptic Pope of Alexandria and Patriarch of the See of St. Mark .When Pope Michael was thrown into prison by Abd al-Malik, king Kyriakos of Makuria marched north into Egypt at the head of an army said to number 100,000 men to free the Pope of Alexandria...

, whom Abd al-Malik had thrown into prison. However, once the Makurian army reached Egypt, the Patriarch was released from prison, along with Kyriakos' envoy, who was then dispatched to Kyriakos to ask him to return to Makuria.