10 Then Judas Iscariot, one of the Twelve, went to the chief priests to betray Jesus to them.

Read Mark 14:10 Using Other Translations

And Judas Iscariot, one of the twelve, went unto the chief priests, to betray him unto them.
Then Judas Iscariot, who was one of the twelve, went to the chief priests in order to betray him to them.
Then Judas Iscariot, one of the twelve disciples, went to the leading priests to arrange to betray Jesus to them.