Colloquia are books in Latin for teaching the Latin language as though it were alive and spoken. They are Latin books in the form of scripted conversations.
In the Renaissance, scholars became aware of an ancient student Latin textbook, given the rather unfortunate name of the Hermeneumata; (We have no idea what the Romans called it). This is a conversational manual for Greeks studying Latin (or Romans studying Greek).
The text that survives dates from the year 200 AD. This Latin and Greek textbook gives little daily conversations about familiar things, like waking up, dressing, going to school and so on.
This student textbook also included bilingual Latin fables, and stories from Roman and Greek mythology.
Scholars during the time of the great Latin revival deliberately set out to copy this methodology, and from the late 1400's, right through to the early 1900's, a large number of dialogues and student level readers were written.
They cover a wide range of ability levels. Some, like those of Comenius, Corderius and Erasmus were extremely famous and widely used in schoolrooms and universities for hundreds of years.
Massebieau: Les Colloques Scolaires du Seizième Siècle et leurs auteurs (1480-1570)
Adler: A Practical Grammar of the Latin Language teaches Latin through micro dialogues. LEVEL: BEGINNER
Alexius Albanus Dialogus (2001)
Bhagavad-Gita, id est Thespesion melos, sive Almi Krishnae et Arjunae
Balboni and Neri: Colloquia Latino Sermone Conscripta (Colloquia with an Italian facing translation)
Capellanus: Do You Speak Latin? (Latin and German)
Castellio: Dialogorum Sacrorum
Comenius: Schola Ludus
Corderius: Colloquies (Hoole)
Corderius: Colloquies (Latin - German)
Corderius: Colloques (Latin - French)
Corvinus: Latina Idioma
Donatus: Donatus Novus
D'Ooge: Colloquia Latina
Erasmus: Colloquia Familiaria Nonnulla Selecta (Clarke)
Fontanus: Hortulus Puerorum
Galileo: Dialogus de systemate mundi
Hanthaler: Exercitationes Faciles de Numis Veterum
Heyden: Formulae Puerilium Colloquiorum
Hoole: Childrens talke, English and Latine, etc. Pueriles Confabulatiunculæ
Hutteni, Ulrich Dialogi Huttenici
Leech, John Four Colloquies (At end of A Booke of Grammar,, 1650) LEVEL: BEGINNER
Milton Valente: Ludus Primus ( A Latin reader with some colloquia) LEVEL: BEGINNER
Milton Valente: Ludus Secundus ( A Latin reader with some colloquia)
Milton Valente: Ludus Tertius ( A Latin reader with some colloquia)
Milton Valente: Ludus Quartus ( A Latin reader with some colloquia)
Patrick and Piazza: Colloquia Cottidiana LEVEL: BEGINNER
P.K. The Scholar's Instructor. A Latin Speaking Book. LEVEL: BEGINNER
Pontanus: Progymnasmata Latinitatis sive Dialogi
Pontanus: Colloquia Sacra
Pontanus Actius Dialogos
Rowbotham, John Lectiones Latinae LEVEL: INTERMEDIATE
Ruddimann: Matho; sive cosmotheoria puerilis, dialogus
Sauveur: Colloquia Caesariana
Savonarola: Dialogus Inter Spiritum et Animam
Schottenius: Colloquia Sive Confabulationes Tyronum Literatorum
Schwieder: Latine Loquor
Stevenson: Early Scholastic Colloquies
Torrentinus: Collocutiones Duorum Puerorum
Vives: Linguae Latinae Exercitatio
Waschiczek: Dialogus Inter Clericum Et Militem
Wilby: How to Speak Latin