The Maya city conquered by Teotihuacan in 378 AD was Tikal.
The event occurred in January 378, when the Teotihuacan-linked warlord Sihyaj K’ahk’ arrived at Tikal. Maya inscriptions, especially Tikal’s Stela 31, record a political upheaval in which the reigning king, Chak Tok Ich’aak I, was removed and a new ruler, Yax Nuun Ahiin I, was installed.
This takeover marked a major turning point in Tikal’s history. Teotihuacan was located roughly 1,000 kilometers away in central Mexico, yet its military, diplomatic, and cultural influence reached deep into the Maya Lowlands. Tikal subsequently displayed strong Teotihuacan connections in royal imagery, architecture, and political relationships.
The wording “conquered by Teotihuacan” is a useful quiz summary, although scholars debate the precise nature of Teotihuacan’s involvement: it may have been direct military intervention, a coalition led by Teotihuacan, or a campaign conducted by a Teotihuacan-backed faction. The securely associated city in the 378 event is Tikal, not Calakmul, Palenque, or Copan.