See Constantine de Administrando Imperio, c. 3, 4, 13, 38 - 42, Katona has nicely fixed the composition of this work to the years 949, 950, 951, (p. 4 - 7.) The critical historian (p. 34 - 107) endeavors to prove the existence, and to relate the actions, of a first duke Almus, the father of Arpad, who is tacitly rejected by Constantine.