Dawit II (Ge'ez: ዳዊት; c. 1496 – 2 September 1540), better known by his birth name of Lebna Dengel, and also known by the macaronic name Wanag Segad, was Emperor of Ethiopia from 1508 to 1540, whose political center and palace was in Shewa.

A male line descendant of the medieval kings, and thus a member of the House of Solomon, he was the son of Emperor Na'od and Empress Na'od Mogesa. The important victory over the Adal's Emir Mahfuz may have given Dawit the appellation "Wanag Segad," which is a combination of Geʽez and the Harari terms.

In contrast to previous emperors, Dawit had only one wife, Seble Wongel, whom he married around 1512–13. The couple had eight children: four sons and four daughters. Taking only one wife throughout his life was seen as a Christian act that fit with the ideals of the Church.

Although she was well into her seventies, the Empress Mother Eleni stepped in to act as her step-great-grandson's regent until 1516, when he came of age. During this time, she was aware that the neighboring Muslim states were benefitting from the assistance of other, larger Muslim countries like the Ottoman Empire.

Eleni sought to neutralize this advantage by dispatching the Armenian, Mateus to Portugal to ask for assistance. However, the Portuguese response did not arrive in Ethiopia until much later, when an embassy led by Dom Rodrigo de Lima arrived at Massawa on 9 April 1520. Traversing the Ethiopian highlands, they did not reach Dawit's camp until 19 October of that year. Francisco Álvares provided a description of the Emperor:

We saw the Prester John sitting on a platform of six steps very richly adorned. He had on his head a high crown of gold and silver, that is to say, one piece of gold and another of silver from the top downwards, and a silver cross in his hand; there was a piece of blue taffeta before his face which covered his mouth and beard, and from time to time they lowered it and the whole of his face appeared, and again they raised it. The Prester was dressed in a rich mantle of gold brocade, and silk shirts of wide sleeves. From his knees downwards he had a rich cloth of silk and gold well spread out like a Bishop's apron, and he was sitting in majesty as they paint God the Father on the wall. In age, complexion, and stature, he is a young man, not very black. His complexion might be chestnut or bay, not very dark in color; he is very much a man of breeding, of middling stature; they said that he was twenty-three years of age, and he looks like that, his face is round, the eyes large, the nose high in the middle, and his beard is beginning to grow. In presence and state he fully looks like the great lord that he is.

A follower of his late father, the monk Gebre Andrias slayed Emir Mahfuz of Adal in 1517, at the Battle of Fatagar (1516). About the same time, a Portuguese fleet attacked Zeila, a Muslim stronghold, and burned it. Dawit would then proceed to ravage Adal and lay waste to Sultan Muhammad ibn Azhar ad-Din's residence in Dakkar. Contemporaries concluded that the Muslim threat to Ethiopia was finally over, so when the diplomatic mission from Portugal arrived at last, Dawit denied that Mateus had the authority to negotiate treaties, ignoring Eleni's counsels. After a stay of six years, the Portuguese at last set sail and left a governing class who thought they were securely in control of the situation. As Paul B. Henze notes, "They were mistaken."

According to Ethiopian chronicles, two decades into Dawit's ascension, a young man by the name Ahmed Ibrahim had rebelled against the Adal leaders and spread terror in the region. Dawit sent his general Delghan into Adal to confront him however the Abyssinian army was defeated at the Battle of Hubat by Ahmed's warriors.