Image: Duryodhana and Shalya

Duryodhana asks Shalya to be Karna's charioteer

(illustrated Mahabharata)

For more about Duryodhana and Shalya, see Wikipedia.

Image: Shalya and Karna

Shalya tells Karna the story of the swan and the crow

(illustrated Mahabharata)

You can read more about Karna at Wikipedia.