peacemaker
US /ˈpiːsˌmeɪ.kɚ/
UK /ˈpiːsˌmeɪ.kɚ/

1.
pacificateur, médiateur
a person who brings about peace, especially by reconciling adversaries
:
•
She acted as a peacemaker between the two arguing factions.
Elle a agi en tant que pacificateur entre les deux factions en conflit.
•
He's always the peacemaker in our family disputes.
Il est toujours le pacificateur dans nos disputes familiales.