Based on the provided source material, there is no information regarding a city named Prangi in Indonesia. Instead, the term "prangi" refers to a specific type of historical artillery. It was a breech-loading swivel gun produced by the Ottoman Empire.
The prangi was subsequently copied and manufactured in other regions, including the Mughal Empire under Babur. Various alternative names for this weapon include paranki, piranki, pirangi, farangi, firingi, or firingiha.