LMILP is one of the similar European projects which were launched in response to the plea of the International Union of Academies. Being published since 1953, it can be said to be an example to be followed by authors of other European dictionaries. Its distinct quality has been proved by reviewers of renowned philological journals. Editorial rules of the Lexicon have been established by its first editor, Prof. Marian Plezia, a scholar of international renown. In 1988-2005 it was Prof. Krystyna Weysenhoff-Brożkowa who was a chief editor of the Lexicon. Nowadays, work on Lexicon is governed by Michał Rzepiela, PhD.