What is "cebalinus"

Cebalinus or Kebalinos , a brother of Nicomachus, who lived on licentious terms with Dimnus, the author of the plot against the life of Alexander the Great in 330 BC. Nicomachus acquainted his brother with the plot, and the latter revealed it to Philotas that he might lay it before the king ; but as Philotas neglected to do so for two days, Cebalinus mentioned it to Metron, one of the royal pages, who immediately informed Alexander. Cebalinus was forthwith brought before the king, and orders were given to arrest Dimnus.