The Collaborative International Dictionary of English v.0.48:

Rong \Rong\, obs.
   imp. & p. p. of Ring. --Chaucer.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Rong \Rong\, n.
   Rung (of a ladder). [Obs.] --Chaucer.
   [1913 Webster]