One of my – and my family’s – Christmas gifts to myself was a trip to “Power and Pathos: Bronze Sculpture of the Hellenistic World,” which is at the National Gallery of Art through March 20.

For me, an amateur classicist whose love of Greco-Roman culture threads all of my writing, “Power and Pathos” in Washington was something of a Holy Grail. It originated at the J. Paul Getty Museum in Los Angeles – one of two big shows on the ancient Greeks to appear this year, the other being “The Body Beautiful in Ancient Greece” at the British Museum.

But neither London nor Los Angeles was in my game plan and when my annual Christmas trip to Washington arrived, so did my moment.

That moment didn’t disappoint, for no sooner did my photographing nephew and I enter the exhibit than we encountered “Alexander the Great on Horseback,” a small first century B.C. silver-inlaid bronze replica of the bronze original by Lysippos, the only artist allowed to capture Alexander’s likeness besides the painter Apelles and the gem-carver Pyrgoteles. The backdrop for this equestrian statue is a reproduced portion of “The Alexander Mosaic” (circa 100 B.C.), depicting the Greco-Macedonian conqueror’s defeat of the Persian emperor Darius III at the Battle of Issus. (Both works are in the Museo Archeologico Nazionale in Naples.) ...