Gesta Hungarorum, or The Deeds of the Hungarians, is the earliest book about Hungarian history which has survived for posterity. Its genre is not chronicle, but gesta, meaning "deeds" or "acts", which is a medieval entertaining literature. It was written in Latin by an unidentified author who has traditionally been called Anonymus in scholarly works. According to most historians, the work was completed between around 1200 and 1230. The Gesta exists in a sole manuscript from the second part of the 13th century, which was for centuries held in Vienna. It is part of the collection of Széchényi National Library in Budapest. The principal subject of the Gesta is the Hungarian conquest of the Carpathian Basin at the turn of the 9th and 10th centuries, and it writes of the origin of the Hungarians, identifying the Hungarians' ancestors with the ancient Scythians. Many of its sources—including the Bible, Isidore of Seville's Etymologiae, the 7th-century Exordia Scythica, the late 9th-century Regino of Prüm's Chronicon, and early medieval romances of Alexander the Great—have been identified by scholars. Anonymus also used folk songs and ballads when writing his work. He knew a version of the late 11th-century "Hungarian Chronicle" the text of which has partially been preserved in his work and in later chronicles, but his narration of the Hungarian Conquest differs from the version provided by the other chronicles. Anonymus did not mention the opponents of the conquering Hungarians known from sources written around 900, but he wrote of the Hungarians' fight against rulers unknown from other sources. According to a scholarly theory, he used place names when naming the opponents of the Hungarians. Background Although the Hungarians, or Magyars, seem to have used their own alphabet before adopting Christianity in the 11th century, most information of their early history was recorded by Muslim, Byzantine and Western European authors. For instance, the Annals of Fulda, Regino of Prüm's Chronicon, and Emperor Constantine VII's De administrando imperio contain contemporaneous or nearly contemporaneous reports of their conquest of the Carpathian Basin at the turn of the 9th and 10th centuries. Among the Hungarians, oral tradition—songs and ballads—preserved the memory of the most important historical events. The Illuminated Chronicle explicitly stated that the "seven captains" who led the Hungarians during the Conquest "composed lays about themselves and sang them among themselves in order to win worldly renown and to publish their names abroad, so that