Principal English Translation:
a noble and generous gentleman (see Molina); a high-born noble; also, the child of a ruler
Alonso de Molina:
tlatocapilli. cauallero noble y generoso.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 140v. col. 1. Thanks to Joe Campbell for providing the transcription.
Attestations from sources in English:
Auh in innahuac tlaqua ca yehuantin in ilhuicac tlatocapipiltin Angeles = And he is eating with the angels, the high-born nobles of Heaven
Bartolomé de Alva, A Guide to Confession Large and Small in the Mexican Language, 1634, eds. Barry D. Sell and John Frederick Schwaller, with Lu Ann Homza (Norman: University of Oklahoma Press, 1999), 151.
Intla tlatocaconetl, intla tlatocapilli = If it was a child of a ruler, the son of a ruler (central Mexico, sixteenth century)
Fr. Bernardino de Sahagún, Florentine Codex: General History of the Things of New Spain; Book 6 -- Rhetoric and Moral Philosophy, No. 14, Part 7, eds. and transl. Arthur J. O. Anderson and Charles E. Dibble (Santa Fe and Salt Lake City: School of American Research and the University of Utah, 1961), 183.
Attestations from sources in Spanish:
Auh in innahuac tlaqua ca yehuantin in ilhuicac tlatocapipiltin Angeles = y con quienes se sienta a la mesa, son los Cortesanos Celestiales los Angeles, y Diuinas criaturas
Bartolomé de Alva, A Guide to Confession Large and Small in the Mexican Language, 1634, eds. Barry D. Sell and John Frederick Schwaller, with Lu Ann Homza (Norman: University of Oklahoma Press, 1999), 150–151.yn quifirmayotique tlahtocapipill [...]yxhuiã tlahtouani. neçahualpiltontli = Los tlatocapipiltin, los nietos del tlatoani Nezahualpilli, la firman. (Tetzcoco, 1587)
Benjamin Daniel Johnson, “Transcripción de los documentos Nahuas de Tezcoco en los Papeles de la Embajada Americana resguardados en el Archivo Histórico de la Biblioteca Nacional de Antropología e Historia de México”, en Documentos nahuas de Tezcoco, Vol. 1, ed. Javier Eduardo Ramírez López (Texcoco: Diócesis de Texcoco, 2018), 138–139.