The only Sith Lords in canon right now are Darth Momin, Darth Shaa, Darth Krall, Darth Tanis, Darth Sanguis, Darth Noctyss, Viceroy Exim Panshard, Darth Caldus, Ry Nimbus.

We know nearly nothing about when they lived and canon gives us no concrete galactic history before the High Republic Era.

So in lack of a canon timeline. Where would u place these Sith in legends eras ?

Krall in New Sith Wars? Caldus and Nimbus in Banite line? Tanis in Pre-Great-Hyperspace-War Sith Empire?