On public view until the beginning of August, The Polish Rider is one of only two equestrian portraits to have been painted by the Dutch master and its fleeting return has been seen as a major coup by art fans in Poland.
The masterpiece 'The Girl in the Picture Frame' shows off all the artistic skills of the famed painter.
The Royal Castle in Warsaw joins the international celebration of Rembrandt Year with 36 original works by the Dutch master.
The museum bears the name of the Czartoryskis, a Polish princely family. Founded in Puławy in 1801 by Princess Izabela Czartoryska, it claims to be the oldest museum facility in Poland.