Rulers and elders and scribes (τους αρχοντας κα τους πρεσβυτερους κα τους γραμματεις). The three classes composing the Sanhedrin (rulers=chief priests who were Sadducees, the scribes usually Pharisees, the elders not in either class: 24 priests, 24 elders, 22 scribes).

Were gathered together (συναχθηνα). First aorist passive infinitive of συναγω with accusative of general reference and the subject of εγενετο.