496 pixel art icons for medieval fantasy RPG were created by Henrique Lazarini (7Soul1)
Source: https://opengameart.org/content/496-pixel-art-icons-for-medievalfantasy-rpg

They are licensed as 'Public Domain':
"You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission: http://creativecommons.org/publicdomain/zero/1.0/"