The idealised, inscrutable character has encouraged various theories about its subject, if the picture is a portrait. Candidates have included
Marcjan Aleksander Ogiński from the
Polish-Lithuanian Ogiński family, as asserted by the 18th-century owners of the painting; and
Jonasz Szlichtyng, Polish Protestant theologian. Others believe that the outfit of the rider, the weapons and even the breed of horse are all Polish. Dutch equestrian portraits were infrequent in the 17th century and traditionally showed a fashionably dressed rider on a well-bred, spirited horse, as in Rembrandt's
Frederick Rihel. Historical characters have also been suggested, ranging from
Old Testament David to the
Prodigal Son and the
Mongolian warrior
Tamerlane, or the Dutch medieval hero,
Gijsbrecht IV of Amstel. A “soldier of Christ”, an idealistic representation of a mounted soldier defending Eastern Europe against the
Turks, or simply a foreign soldier have been suggested. The young rider appears to many people to face nameless danger in a bare mountainous landscape that contains a mysterious building, dark water and in the distance evidence of a fire. In his film The Art Mysteries, the Polish art critic Waldemar Januszczak argues that the rider represents the First Horseman of the Apocalypse, who rides a white horse, carries a bow and brings 'Conquest', as described in the Book of Revelation (6:2). The rider is crossing the devastated landscape of Europe after the Thirty Years' War, and is on the way to the New Jerusalem as predicted by millenarians in the Second Coming of Christ. In a 1793 letter to
King Stanislaus Augustus of the
Polish–Lithuanian Commonwealth, the painting's owner
Michał Kazimierz Ogiński identified the rider as "a
Cossack on horseback", and the king recognized the subject as a member of the irregular military unit known as
Lisowczyk. In 1883, Wilhelm Bode, an expert in Dutch painting, described the rider as a Polish magnate in the national costume. In 1944, the American Rembrandt scholar
Julius S. Held contested the claim that the subject was Polish and suggested the rider's costume could be
Hungarian. Two Polish scholars suggested in 1912 that the model for the portrait was Rembrandt's son
Titus. ==Provenance==