Simeon I of Bulgaria
Following the death of Simeon I of Bulgaria, Byzantium no longer needed Croatia's military support and repealed its alliance. Previously, Byzantium relied heavily on the Croats to threaten Simeon from the west. Despite the achievements of King Tomislav in halting Bulgaria's expansion, Byzantium reversed Croatia's supremacy over the Theme of Dalmatia, which fell once again under its administration. However, Byzantine administration was nominal.