The Invincible Barbarian - 1982
original title:
Gunan il guerriero
aka:
Gunan, el guerrero
Gunan - König der Barbaren
Gunan, King of the Barbarian
Lost Warrior
Mervians Sohn
O Imperador dos Bárbaros

VHS version has intro sequences and narration as well as at parts in the film, not present in the only DVD I have found, or on the Amazon version, (That is, or used to be available free on prime) which seemed to be from the same master copy.

This is the dvd:
https://ssl.ofdb.de/view.php?page=fassung&fid=24170&vid=330473