Which chapter of De Jure Praedae was published as Mare Liberum in 1609?

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Oil portrait of Hugo de Groot, also known as Hugo Grotius, by the workshop of Michiel Janszoon van Mierevelt, showing him with a ruffled white collar and dark clothing. — Hugo Grotius Portrait of Hugo de Groot (Hugo Grotius), oil on panel by the workshop of Michiel Janszoon van Mierevelt, 1631; in the Rijksmuseum, Amsterdam.

The chapter of De Jure Praedae that was published independently in 1609 under the title Mare Liberum is chapter 12.1

In this influential text, Hugo Grotius argued for the freedom of the seas, asserting that the ocean should be accessible to all nations for trade and navigation, thereby challenging the monopolistic claims held by Spain and Portugal at the time.1