Lasaia agesilas, the glittering sapphire, black-patch bluemark or Narses metalmark is a metalmark butterfly (family Riodinidae). The species was first described by Pierre André Latreille in 1809. It is native to Central America and the north of South America. It ranges from Costa Rica, Panama, Venezuela, Trinidad, Colombia, Ecuador, Peru, Bolivia, Guyana, to the Brazilian Amazon. The top of the wings is metallic blue with black markings.