Question

Who is the Leader of the Order of Stag?
How you know ''thats'' the leader?

Added source to the answer please.

Answer 1

The Etzel family was created by Cadwgan Etzel and from him there are two lineages the royal linage and the bastard one, the royal is the Order of Falcon, Cobra and the Lion. The Stag is the bastard one, Eldoran Etzel being the leader and Eldoran the ambitious being the current leader and ruler of the Ada isle.

Source : https://www.tibiawiki.com.br/wiki/Fam%C3%ADlia_Etzel

https://www.tibiawiki.com.br/wiki/The_Line_and_Heritage_of_the_Venerable_Eldoran_Etzel_(Book)

Answer 2

The Order of the Lion was founded by Kesar Etzel, who, along with his siblings, were the founders of different orders from the time of the King Xenom (1). The order, nowadays, is ruled by his direct descendant, Kesar the Younger (1).

Not only this but, on Kesar the Younger's page on Wiki (2), it says he stands on the Throne Room during the day, indicating that he is in some position of power. 

If you want more information on the lore from the Order of the Stag, check the transcripts from the talks with Kesar the Younger during the quest The Order of the Stag Quest/Spoiler (3).

Sources:
(1) https://tibia.fandom.com/wiki/Kesar_Etzel
(2) https://tibia.fandom.com/wiki/Kesar_the_Younger
(3) https://tibia.fandom.com/wiki/The_Order_of_the_Stag_Quest

Comments

Okey, thats good part of lore, but what about the leader of the Stags?

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Kesar is not leader of the order of stags, only the order of the lions

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Downvoted due to incorrect information. Please edit to provide correct info about Kesar. Thank you!