the principal or older scribe, painter, or notary (see Molina)
Alonso de Molina:
tlacuiloca teachcauh. escriuano principal, o mayor. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 120r. col. 1. Thanks to Joe Campbell for providing the transcription.