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In the religious sphere, this was a period of profound change. The spiritual revolution that took place, saw a waning of the old Greek religion, whose decline beginning in the 3rd century BC continued with the introduction of new religious movements from the East. The cults of deities like Isis and Mithra were introduced into the Greek world. Greek-speaking communities of the Hellenized East were instrumental in the spread of early Christianity in the 2nd and 3rd centuries, and Christianity's early leaders and writers (notably St Paul) were generally Greek-speaking, though none were from Greece. However, Greece itself had a tendency to cling to paganism and was not one of the influential centers of early Christianity: in fact, some ancient Greek religious practices remained in vogue until the end of the 4th century, with some areas such as the southeastern Peloponnese remaining pagan until well into the 10th century AD.

When did the religions of the past begin to dissipate ?
Answer: decline beginning in the 3rd century BC
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Tristan da Cunha is part of the British overseas territory of Saint Helena, Ascension and Tristan da Cunha. This includes Saint Helena and equatorial Ascension Island some 3,730 kilometres (2,318 mi) to the north of Tristan. The island has a population of 267 as of January 2016.

what territory is Tristan da Cunha part of?
Answer: the British overseas territory of Saint Helena
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London is also home to sizeable Muslim, Hindu, Sikh, and Jewish communities. Notable mosques include the East London Mosque in Tower Hamlets, London Central Mosque on the edge of Regent's Park and the Baitul Futuh Mosque of the Ahmadiyya Muslim Community. Following the oil boom, increasing numbers of wealthy Hindus and Middle-Eastern Muslims have based themselves around Mayfair and Knightsbridge in West London. There are large Muslim communities in the eastern boroughs of Tower Hamlets and Newham. Large Hindu communities are in the north-western boroughs of Harrow and Brent, the latter of which is home to Europe's largest Hindu temple, Neasden Temple. London is also home to 42 Hindu temples. There are Sikh communities in East and West London, particularly in Southall, home to one of the largest Sikh populations and the largest Sikh temple outside India.

What is the name of the largest Hindu temple in Europe?
Answer:
Neasden Temple