Performative engagements with specific, culturally significant places were among the primary means of configuring landscapes in the ancient world. Ancient states often appropriated symbolic or ritual landscapes through commemorative ceremonies and building operations. These commemorative sites became event-places where state spectacles encountered and merged with local cult practices. The Early Iron Age inscriptions and reliefs carved on the cave walls of the Dibni Su sources at the site of Birkleyn in Eastern Turkey, known as the ‘Source of the Tigris’ monuments, present a compelling paradigm for such spatial practices. Assyrian kings Tiglath-pileser I (1114–1076 B.C.) and Shalmaneser III (858–824 B.C.) carved ‘images of kingship’ and accompanying royal inscriptions at this impressive site in a remote but politically contested region. This important commemorative event was represented in detail on Shalmaneser III's bronze repoussé bands from Imgul-Enlil (Tell Balawat) as well as in his annalistic texts, rearticulating the performance of the place on public monuments in Assyrian urban contexts. This paper approaches the making of the Source of the Tigris monuments as a complex performative place-event. The effect was to reconfigure a socially significant, mytho-poetic landscape into a landscape of commemoration and cult practice, illustrating Assyrian rhetorics of kingship. These rhetorics were maintained by articulate gestures of inscription that appropriated an already symbolically charged landscape in a liminal territory and made it durable through site-specific spatial practices and narrative representations.