The following paper is based on an investigation of the personal diary notes of a Russian diplomat Georgiy Planson
(1859–?) that were taken during the period from 1910 to 1913. Planson served as Charge d’Affaires and Consul General
in Siam between 1910 and 1916. The relevancy of the research arises from the fact that these diaries, as well as multiple
other private information sources belonging to other members of the Russian diplomatic mission, have been scarcely
if ever studied or analyzed so far. The contents of Planson’s diaries can be divided into four main topics: relationships
between Siam and the Russian Empire, international life in Bangkok, leisure and recreation of the diplomatic mission
members, and the incoming/outgoing correspondence registration. The performed analysis enabled to easily determine
the overall impression the Kingdom of Siam made on a Russian diplomat, as well as to trace overall tendencies and
attitudes within the diplomatic circles of Bangkok in the 1910s. Microhistorical research methodology was applied in
the current paper.