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Origins. The Kataeb (Phalanges) Party was founded in 1936 by Pierre Gemayel, modelling itself on European nationalist movements of the inter-war period (the trip to the 1936 Berlin Olympics is foundational lore). It was the dominant Christian-right party of the early-postwar Lebanese Republic and provided the militia core of the civil-war Lebanese Forces under Bachir Gemayel before the LF spun off as a separate organisation in the 1980s. The Free Patriotic Movement was founded in 2005 by Michel Aoun, the Maronite Army general who returned from Paris exile after Syria's withdrawal from Lebanon.

Where they diverge. The central cleavage of Maronite politics: the 2006 Mar Mikhael agreement in which the FPM signed a memorandum of understanding with Hezbollah, formally allying Aoun's Christian movement with the Iran-aligned Shia armed resistance. Kataeb has opposed Hezbollah's arms throughout the postwar period and was a principal voice in the 2005 Cedar Revolution that demanded Syrian withdrawal. On the Syrian regime: the FPM aligned with Assad's Syria after 2008; Kataeb was the principal vocal opponent of Syrian influence both during the Hafez al-Assad era and Bashar al-Assad era. On port explosion accountability: Kataeb chair Sami Gemayel was one of the loudest voices demanding accountability after the 2020 Beirut blast; the FPM's Bassil family was implicated by the investigation.

Where they overlap. Both are Christian-right parties operating within the Taif confessional power-sharing arrangement. Both formally accept the 1989 Taif agreement. Both compete for the same Maronite electoral base, alongside the Lebanese Forces (which split off from the Kataeb-Phalanges tradition in the 1980s).

Why it matters today. Kataeb has been a small parliamentary opposition voice through the 2010s and 2020s. The FPM was the leading Christian party while Aoun held the presidency 2016-2022; under Bassil's leadership since 2022 it has weakened. The Christian-right space is now structured around Kataeb + Lebanese Forces opposing FPM's residual Hezbollah-alignment legacy.