Daldis (Ancient Greek: Δάλδις, ἡ Δάλδις), was a town on the borders of ancient Lydia and Phrygia, a former bishopric, and is now a Latin Catholic titular see. It also minted coins in antiquity with the legend Δαλδιανων. It also bore the name Flaviocaesaria or Phlabiokaisareia, which is not attested among ancient authors but is reconstructed from epigraphic and other evidence.
The Ancient city of Daldis was located near Narlïkale in Asia Minor (modern Asian Turkey). It was in Lydia. Ramsay believed it was on the Meander River, near the towns of Apollonos-Hieron and Tripolis.
The diocese was founded in early Roman times and sent delegates to many important councils. Bishops include: