Diocese of Nyssa (Latin: Dioecesis Nyssena) is a titular see in the Catholic Church.
Nyssa (Latin: Nissa) was important enough in the Roman province of Cappadocia Prima to become a suffragan of it capital's Metropolitan, the Archdiocese of Caesarea in Cappadocia (Kayseri).
The bishop at the time of the Council of Ephesus in 431 was Heraclides.
A 10th-century bishop named Germanus is known for his ecclesiastical writings.
[1][2] In the 18th century, the Catholic Church began appointing titular bishops of Nyssa.