A Namestnik, for lack of a better translation, is he who rules "In Place"(Na Meste) of the Head of state. The word has been translated many ways, from Governor to viceroy, but what remains clear is that Pskov used it as a way to name the people in charge of the administration of colonies and islands(and vassal principalities)
The Pskov Imperial Company
The Pskov Imperial Company (PIC) used Namestnik as the title for the active governor of the Coalition of Islands in the Imperial Sea that fell under their control. He, in the place of both the President of the PIC and the Knyaz of Pskov, ruled with their authority over the entirety of the Colony-Islands. The Namestnik of the Pskov Imperial Company (Наместник Псковской Имперской Компании) was appointed for a period of ten and later five years by the Knyaz (and later Velikiy Knyaz) of Pskov, upon, of course, the advice of the President of the PIC. In addition to this, each separate island was allowed to choose a Lieutenant-Namestnik (Наместник-Лейтенант) to help administer the islands individually, who would then be able to council the namestnik of the PIC in a similar manner to that of the election of the Grand Prince of Pskov.
List of Namestniks of the PIC in the Isles
Evgeni Dimitrievich Bogorskiy
Ruslan Feodosievich Kosyakov
Timofey Vassilievich Gorskiy
Yaroslav Vladimirovich Prokhimin
NIkolai Ruslanovich Pozharskiy
Namestniks of the PIC African Division(Zlatobrezhie)
Nikolai Grigorievich Romanov
Actual start of term debatable, as there was no real infrastructure of governance until 1630 other than pure military occupation. Started Russification
Yaroslav Georgievich Godunov
loosened restrictions on language use in public, but required it for any administrative business.
Ivan Sviatoslavovich Belinskiy
Relative Peace, Yaroslav's reforms did the possession well,