Zar'a Ya`qob or Zera Yacob (Ge'ez ዘርአ:ያዕቆብ zar'ā yāʿiqōb "Seed of Jacob," modern zer'a yā'iqōb) (1399 – 26 August 1468) was nəgusä nägäst (19 or 20 June 1434–1468) of Ethiopia (throne name Kwestantinos I Ge'ez ቈስታንቲኖስ qʷastāntīnōs or Constantine I), and a member of the Solomonic dynasty. Born at Tilq in the province of Fatagar (now part of the Oromia Region, near the Awash River), Zara Yaqob was the youngest son of Dawit I and his youngest queen, Igzi Kebra.
The British expert on Ethiopia, Edward Ullendorff, stated that Zara Yaqob "was unquestionably the greatest ruler Ethiopia had seen since Ezana, during the heyday of Aksumite power, and none of his successors on the throne – excepted only the emperors Menelik II and Haile Selassie – can be compared to him."
Paul B. Henze repeats the tradition that the jealousy of his older brother Tewodros I forced the courtiers to take Zara Yaqob to Tigray where he was brought up in secret, and educated in Axum and at the monastery of Debre Abbay. While admitting that this tradition "is invaluable as providing a religious background for Zar'a-Ya'iqob's career", Taddesse Tamrat dismisses this story as "very improbable in its details." The professor notes that Zara Yaqob wrote in his Mashafa Berhan that "he was brought down from the royal prison of Mount Gishan only on the eve of his accession to the throne."
Yaqob I (Ge'ez ያዕቆብ yāʿiqōb, Amh. yā'iqōb), (c. 1590 – 10 March 1606) was nəgusä nägäst (throne name Malak Sagad II, መልአክ ሰገድ, mal'ak sagad, Amh. mel'āk seged, "to whom the angel bows"; 1597–1603; 1604–1606) of Ethiopia, and a member of the Solomonic dynasty. He was the eldest surviving son of Sarsa Dengel. According to E. A. Wallis Budge, Yaqob's mother was Empress Maryam Sena; others sources suggest she was Emebet Harego of the Beta Israel. Because Yaqob had at least three sons before his death, it is likely he was born no later than 1590. Most Ethiopian sources including Tekle Tsadik Mekuria however state that his mother was Harego, but that Empress Maryam Sena championed his right to the throne as she only bore Emperor Sarsa Dengel daughters, and hoped to dominate a long term regency for the boy monarch.
Sarsa Dengel had intended to make his nephew Za Dengel his successor, but under the influence of his wife Maryam Sena and a number of his sons-in-law, he instead chose Yaqob, who was seven when he came to the throne, with Ras Antenatewos of Begemder as his regent. Za Dengel and the other rival for the throne – Susenyos I, the son of Abeto Fasilides – were exiled, but Za Dengel escaped to the mountains around Lake Tana, while Susenyos I found refuge in the south amongst the Oromo.