"Spearthrower Owl" is the name commonly given to a Mesoamerican personage from the Early Classic period, who is identified in Maya inscriptions and iconography. Mayanist David Stuart has suggested that Spearthrower Owl was a ruler of Teotihuacan at the start of the height of its influence across Mesoamerica in the 4th and 5th century, and that he was responsible for an intense period of Teotihuacan presence in the Maya area, including the conquest of Tikal in 378 CE.

Siyaj Kʼakʼ (alternative spelling: Siyah Kʼakʼ), also known as Fire is Born (formerly nicknamed "Smoking Frog"), was a prominent political figure mentioned in the glyphs of Classic Period (250–800 CE) Maya civilization monuments, principally Tikal (which he conquered in January 378), as well as Uaxactun and the city of Copan. Epigraphers originally identified him by the nickname "Smoking Frog", a description of his name glyph, but later deciphered it as Siyaj Kʼakʼ, meaning "Fire is born". He is believed by some to have been the general of the Teotihuacano ruler Spearthrower Owl.