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Just war
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Philippe de Champaigne: Saint Augustine St. Thomas Aquinas 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.
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Philippe de Champaigne: Saint Augustine
Philippe de Champaigne: Saint Augustine Saint Augustine, oil on canvas by Philippe de Champaigne, c. 1645–50; in the Los Angeles County Museum of Art. 78.74 × 62.23 cm.

Just war

international law
Written by
James T. Johnson
Professor of Religion, Rutgers University, New Brunswick, New Jersey. Author of Just War Tradition and the Restraint of War: A Moral and Historical Inquiry, The Holy War Idea in Western and Islamic...
James T. Johnson
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Britannica Editors
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
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•History

Just war, notion that the resort to armed force (jus ad bellum) is justified under certain conditions; also, the notion that the use of such force (jus in bello) should be limited in certain ways. Just war is a Western concept and should be distinguished from the Islamic concept of jihad (Arabic: “striving”), or holy war, which in Muslim legal theory is the only type of just war. Rooted in Classical Roman and biblical Hebraic...

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