Which theological work was especially popular during Hugo Grotius’s lifetime?

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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 theological work that likely enjoyed the highest popularity among Hugo Grotius’s writings during his lifetime was De Veritate Religionis Christianae (1627), also known as The Truth of the Christian Religion.1