Very early were the processions accompanied by hymns and prayers, known as "litaniae", "rogationes" or "supplicationes". It is to such a procession that reference appears to be made in a letter of St Basil, which would thus be the first recorded mention of a public Christian procession. The first mention for the Western Church occurs in St Ambrose. In both these cases the litanies are stated to have been long in use. There is also mention of a procession accompanied by hymns, organized at Constantinople by St John Chrysostom (c. 390–400) in opposition to a procession of Arians, in Sozomen.