DINAmadiya (or Amadia) was a separate eparchy (diocese) of the Chaldean Catholic Church until it was united with the Chaldean Catholic Eparchy of Zakho in 2013.
The diocese was established on 1785 and named for the hilltop city of ʿAmadiya in northern Iraq.
It lost territory in 1850 to establish the eparchies (dioceses) of Aqrā and Zaku (Zākhō), but on 23 April 1895.04.23 it regained territory from the suppressed daughter-diocese of Aqrā, yet on 24 February 1910.02.24 it lost territory again to re-establish the eparchy of Aqrā.
In 1913 it included ʿAmadiya city itself and sixteen villages in the Tigris plain near the town of Dohuk and in the Sapna and Gomel river valleys.
On 10 June 2013 it was renamed as Diocese of Amadiyah and Zaku or Amadia and Zākhō, having gained territory from the suppressed daughter-eparchy of Zaku.
There were three main concentrations of East Syrian villages in the ʿAmadiya region: in the Sapna valley to the west of ʿAmadiya, in the Tigris plain around Dohuk, and in the Shemkan district, around the valley of the Gomel river. Before the fourteenth century the Sapna valley was part of the diocese of Dasen and Beth Ture ('the mountains'), which lay to the north of Marga and also covered the Berwari region and the Zibar and Lower Tiyari districts. The villages in the Dohuk district were included in the East Syrian diocese of Beth Nuhadra, whose bishops resided in the small town of Tel Hesh near Alqosh, and those in the Gomel valley in the diocese of Marga, centred on the ʿAqra region. The last-known bishops of Beth Nuhadra and Dasen, Ishoʿyahb and Mattai, were present at the consecrations of Makkikha II in 1257 and Yahballaha III in 1281 respectively, and it is unclear when either diocese came to an end.