Origins in the French Revolution.
The terms "left" and "right" appeared during the French Revolution of 1789 when members of the National Assembly divided into supporters of the king to the president's right
and
supporters of the revolution to his left.
https://en.wikipedia.org/wiki/Left–right_political_spectrum
Plus in Latin
Sinister (Latin for 'left') indicates the left-hand side as regarded by the bearer
The Left Hand of (Supposed) Darkness
On ‘sinister,’ ‘dexterity,’ ‘gauche,’ and ‘adroit’
Sinister, today meaning evil or malevolent in some way, comes from a Latin word simply meaning "on the left side." "Left" being associated with evil likely comes from a majority of the population being right handed, biblical texts describing God saving those on the right on Judgment day, and images depicting Eve on Adam's left.
On ‘sinister,’ ‘dexterity,’ ‘gauche,’ and ‘adroit’
www.merriam-webster.com