KRI Prabu Siliwangi (321) is a to be operated by the Indonesian Navy. The vessel was originally constructed as Ruggiero di Lauria (P435), the sixth ship of the class built for the Italian Navy.
The construction was started with the first steel cutting ceremony on 7 April 2021 at Fincantieri Muggiano. Ruggiero di Lauria was launched on 10 October 2023.
Ruggiero di Lauria is one of the two Thaon di Revel-class vessels sold to the Indonesian Navy in a 1.18 billion Euro contract, which was signed on 28 March 2024. According to Janes, Indonesia managed to obtain a US$1.25 billion loan from several European financial institutions for the acquisition of the two vessels, with the funding facility signed in late 2024. The ship was acquired by the Indonesian Navy in its initial "Light+" configuration. However, Indonesia has indicated interest on upgrading it to the "Full" configuration.
The ship was renamed as KRI Prabu Siliwangi (321) on 29 January 2025 at a ceremony in Muggiano shipyard. Prabu Siliwangi was handed over to the Indonesian Navy and commissioned on 22 December 2025 at the Muggiano shipyard, its first commander being Colonel Kurniawan Koes Atmadja. The ship was initially planned to arrive in Indonesia by January 2026.
Prabu Siliwangi departed Italy on 11 February 2026. The frigate circumnavigated Africa on its delivery voyage to Indonesia and made port calls in Morocco, Nigeria, South Africa, and Mauritius. Prabu Siliwangi arrived in Bandar Lampung on 22 March. Four days later the ship went to Port of Tanjung Priok in Jakarta to attend its welcoming ceremony.