Former President Barack Obama will visit German Chancellor Angela Merkel as part of the 500th anniversary of the Protestant Reformation, a German church announced Tuesday.

The trip will reunite Obama with Merkel, who doubled as the closest European ally of his presidency and the face of the expansive Syrian refugee policy that President Trump denounced throughout his 2016 campaign. The location of the encounter, at the Brandenburg Gate, sets the scene for what the organizers hope will be an especially-political celebration of the German church’s history.