Tollan was a legendary place (e.g. referring to Aztlan or Cholula) as well as the original name for Tula, a major altepetl in what is now the state of Hidalgo, extremely important as center of a legendary culture and empire (see attestations)
María Castañeda de la Paz identifies the place name glyph for Tollan [tol(lin) + tlan(tli)] in the Codex Mexicanus (plate 18 in her publication of the codex in 2019) as representing Aztlan.
Auh ie iuh, cempoalxiujtl omome, opoliuh in tullan: in açico in tlalmaçeoaco: omotecaco in chichimeca, in vncan tetzcuco. = And twenty-two years after Tollan was destroyed, the Chichimeca came to reach and take the land and establish themselves there in Texcoco. (central Mexico, sixteenth century)
Injc macujlli capitulo, ipan mjtoa: in ie quezqujtzonxiujtl poliuh tullan, in jxquichica xiujtl, de 1565. = Fifth Chapter, in which it is told how many four hundreds of years ago Tollan was destroyed, up to [the present] year of 1565. (central Mexico, sixteenth century)
oncan opano-que tollan caoncan ocazique calzontin, tetepátin, ymachio = From there they went to Tollan, where they found only ruins and signs of walls.
Ye nicān nicchihchīhuaz; ye nicān nicyōlītīz in tenānquiāhuatl, cuauhquiāhuatl, in Tōllān ohtli = Right here I will make the wall-doorway, the wood-doorway, the road to Tollan [i.e., the snare] (Atenango, between Mexico City and Acapulco, 1629)
aocmo ceppa hualmocuep yn oncan Tullam = Never again did he return to Tollan (central Mexico, early seventeenth century)
Tecpatl xihuitl 1116. años. ypan inyn oncan hualmiquanique mexica yn oncan Cohuatepec, yn ihuicpa Tullan. = The year One Flint, 1116. At this time the Mexica moved on to Coatepec, toward Tollan. (central Mexico, early seveneenth century)
quetzalcoatl, tullan tlatoanj catca = Quetzalcoatl was ruler of Tula (central Mexico, sixteenth century)
quetzalcoatl, tullan tlatoanj catca = Quetzalcoatl Rey de Tulla (centro de Mexico, s. XVI)
yzcatqui yn intlatollo yn tolteca chichimeca ynic ualleuaque yn colhuacatepec ynic acico yn tollan yn imacica yn nonouallca oncan yn mocauhque y moxeloque yn tollan = He aquí el relato de los tolteca chichimeca, que vinieron de Colhuacatepec y llegaron a Tollan, con su complemento los nonoualca. Allá en Tollan se quedaron, se dividieron. (Quauhtinchan, s. XVI)
auh yn yeuantin yn tolteca chichimeca oc caxtolxiuhtillique yn oncan tollan = pero los tolteca chichmeca permanecieron aún 15 años en Tollan (Quauhtinchan, s. XVI)