Silenus

possibly Anthony van Dyck, Drunken Silenus Suported by Satyrs, c. 1620, oil on canvas, 133.5 x 197 cm, National Gallery, London

Silenus is a close companion of Dionysus/Bacchus, and taught the young god.  He is known for his wisdom and clairvoyant abillities--it was believed one could see the future by laying garlands upon him while drunk.  

He typically appears alongisde Dionysus/Bacchus, and among Bacchants and satyrs.  Some images also depict him presented before King Midas.