Marcos 5:9

These verses resume the conversation from Mark 5:7. A legion was six thousand Roman soldiers. Probably the leading demon used this as a round number to represent thousands of demons (cf. Mark 5:13). The word "legion" also suggests their organization, strength, oppression, and authority over the man they influenced. [Note: Hiebert, p. 120.] Probably Jesus asked this question for the disciples’ benefit.