The Diocese of Domokos (Latin dioecesis Domocensis or Dimicensis) or Thaumaci (Thaumacensis) was an ancient bishopric centred on the town of Domokos. It has been a suffragan of the See of Larissa since 732, when it ceased to be under the jurisdiction of the Patriarch of the West (the Pope). In 1882, when Domokos became part of the Kingdom of Greece, the diocese became subject to the autocephalous Church of Greece. It was suppressed in 1899.
In 1204, when Domokos fell to the Fourth Crusade, the authority of the Pope was reestablished and a series of Latin bishops held the diocese. The impoverished diocese was incapable of supporting more than three clergy in 1210, and in July 1208 it had been administratively united to the diocese of Kalydon by Pope Innocent III. Its incumbent at that time was a Burgundian, Gales of Dampierre, the second Latin bishop. After Domokos was reconquered by the Byzantine Empire, it became a titular see for the Latins. Three medieval titulars are known: Marcus Morellus, from about 1334; John, who died in 1366; and his successor, another John, a Franciscan friar. The Latin diocese of Domokos has been vacant since 21 November 1943.
| Titular bishops of Domokos (Thaumaci) | |||||
| No. | Name | Office | from | to | |
|---|---|---|---|---|---|
| 1 | Enrique Lasso de la Vega | 15 December 1728 | |||
| 2 | Ramón Falcón Salcedo | Abbot of San Ildefonso | 25 November 1790 | 21 February 1794 | |
| 3 | Francisco Javier de Lizana y Beaumont | 18 December 1795 | 11 August 1800 | ||
| 4 | József Király | Auxiliary bishop of Esztergom | 18 September 1807 | 11 January 1808 | |
| 5 | Justo Santa María de Oro y Albarracín, OP | Apostolic Vicar of San Juan de Cuyo | 15 December 1828 | 30 September 1834 | |
| 6 | Johann Georg Müller | Auxiliary bishop of Trier | 22 July 1844 | 4 October 1847 | |
| 7 | John Thomas Mullock, OFM | Coadjutor of St. John's | 14 December 1847 | 14 July 1850 | |
| 8 | Georges-Claude-Louis-Pie Chalandon | Coadjutor of Belley | 3 October 1850 | 25 July 1852 | |
| 9 | Manuel Ignacio Riaño, OP | Apostolic Vicar and Coadjutor of Bùi Chu | 20 August 1866 | 26 November 1884 | |
| 10 | Peter Bourgade | Apostolic Vicar of Tucson | 7 February 1885 | 10 May 1897 | |
| 11 | Jean-Marie Simon, OSFS | Apostolic Vicar of Keimoes-Upington | 3 May 1898 | 21 November 1932 | |
| 12 | Marie-Luc-Alphonse-Emile Barillon, MEP | 10 January 1933 | 27 July 1935 | ||
| 13 | Gustave-Georges-Arsène Vandaele, MEP | Apostolic Vicar and Coadjutor of Hung Hoá | 7 July 1936 | 21 November 1943 | |