Bogos Chachian

The Ottoman empire was represented by three important publications, one of which was L Architecture Ottomane ( Usul-u mimari-i Osmani, ),  the fruit of the collaboration of Marie de Launay, Pietro Montani, Adolphe Maillard and the Ottoman Armenian Painter Bogos Chachian.L Architecture Ottomane were provided by Pietro Montani (or Montani Efendi), an Ottoman Levantine artist of Italian origin.The Technical Documents in the Usul constituting a separate section entitled “The Theory of Ottoman Architecture”, were provided by Pietro Montani (or Montani Efendi), an Ottoman Levantine artist of Italian origin.Montani also executed most of the drawings and color plates, with the exception of a few plans by Marie de Launay and some additional renderings of decorative components by the French artist Eugène Maillard and the Ottoman Armenian painter Bogos Chachian.

Sources
Muqarnas, Volume 24
Istanbul 1900:
art-nouveau architecture and interiors by Diana Barillari, Ezio Godoli
Usul-u mimari-i Osmani