Gladius

Star Wars: Knights of the Old Republic

Jade Empire

Gladius

Steel Battalion (only if they come up with an adapter for that giant 40-ish button controller)

Populous

Nothing from the 360 generation (Halo is fine because it includes 2 from the Xbox generation as well as the 360 generation)

Knights of the Old Republic

Jade Empire

Gladius

Hi,

the available here:
https://www.xbox.com/en-GB/xbox-one/backward-compatibility/available-games

Gladius is not on the program.

Hi there,

If you would like to suggest a game for backwards compadibility I would recommend reaching out to Microsoft directly with your feedback as this will ensure the right people are seeing it.

I would recommend checking out https://xboxideas.uservoice.com/ to see if it's nominated to become a backwards compatible game. If it is, you can vote on it. If not, you can create a new suggestion to become
Backwards compatible.