The 1876 â `` 1877 Constantinople Conference ( or â Shipyard Palace Conferenceâ , from the conference venue ) of the Great Powers ( Britain , Russia , France , Germany , Austria-Hungary and Italy ) was held in Istanbul ( Constantinople ) from 23 December 1876 until 20 January 1877 . The 1876 â `` 1877 Constantinople Conference ( from the conference venue Tersane SarayÄ or ` Shipyard Palace ' ) of the Great Powers ( Britain , Russia , France , Germany , Austria-Hungary and Italy ) was held in Constantinople ( Istanbul ) from 23 December 1876 until 20 January 1877 .