The Sepulveda Period was a cultural period on the planet Tagus III. Artifacts found in the ruins dating to this period were recovered by the Jacobson Excavation of the Vulcan Science Academy. This excavation occurred prior to the sealing of those ruins by the Taguan government in the mid-23rd century. (TNG: "Qpid")
Information on this period is from an okudagram titled Tagus III Archaeological Notes which was perused by Captain Jean-Luc Picard in 2367.
It was named after art department member Fernando Sepulveda.