Hadiya also known as Adea or Hadia was a medieval Muslim state in the southern part of its realm located south of Shewa and west of Sharkha. The Hadiya Muslim state mainly composed of Cushitic Hadiyya proper, Halaba, Kebena people as well as Semitic Sil'te and other tongues related to Harari language. Hadiya was historically a vassal state of the Adal federation and then became an autonomous province of Abyssinia in the fourteenth century while still remaining a member of the Zeila union.[1][2] In the 1600s Hadiya regained its independence and was led by a Garad.[3] By 1850, Hadiya is placed north-west of lakes Zway and Langano but still between these areas.[4]
Hadiya was described in the mid-fourteenth century by the Arab historian Shihab Al-Umari as measuring eight days' journey by nine, which Richard Pankhurst estimates was 160 by 180 kilometers. Although small, Hadiya was fertile with fruit and cereals, rich with horses, and its inhabitants used pieces of iron as currency. It could raise an army of 40,000 cavalry and at least twice as many foot soldiers.[5]