Trpimir II (died ca. 935) was a King of Croatia from 928 to 935. He was from the House of Trpimirović. Trpimir was probably the son of Duke Muncimir and younger brother of Tomislav.
Following the death of Simeon I of Bulgaria, Byzantium no longer needed Croatia's military support and repealed its alliance.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 Symeon from the west. Despite the achievements of King Tomislav in halting Bulgaria's expansion, Byzantium reversed Croatia's supremacy over the Dalmatian thema, which fell once again under its administration. However, Byzantine administration was nominal.
Trpimir's woes did not stop there. Pope Leo VI abolished the Diocese of Nin in 928 and transferred Bishop Grgur to Skradin, in what was seen as a humiliating defeat for pro-Slavic proponents in the long running dispute between the Split and Nin Bishoprics.
The De Administrando Imperio mentions that in the time of Trpimir, Croatia had a significant merchant fleet that traded across the entire Adriatic Sea.
- Dzino, Danijel (2010). Becoming Slav, Becoming Croat: Identity Transformations in Post-Roman and Early Medieval Dalmatia. Brill. ISBN 90-04-18646-8, 9789004186460 .
- Fine (Jr), John V. A. (2006). When Ethnicity Did Not Matter in the Balkans: A Study of Identity in Pre-Nationalist Croatia, Dalmatia, and Slavonia in the Medieval and Early-Modern Periods. Ann Arbor: University of Michigan Press. ISBN 0-472-11414-X, 9780472114146 .