According to historian Giorgio Giulini (1714-1780), Truccazzano is named after the 13th-century captain Giovanni da Trocazano, who captured Ezzelino da Romano. Among the aspects based on reliable data are the town's centuries-old agricultural history—in the Bassa, bordering the Bergamo province near the Adda River, along the Rivoltana provincial road—and the interesting Napoleonic-era urban planning system of the Albignano hamlet, centered around Palazzo Anguissola. Also of particular architectural significance are the late-16th-century parish church of San Michele in Truccazzano itself, the so-called Torrettone, which dates back to the 10th century, along the road to Rivolta d'Adda, and the presence of the massive Borromeo Castle, originally from the 12th century but now restored, in the hamlet of Corneliano Bertario, a charming village with a pleasant setting, home to an ancient parish church. The coat of arms of the Municipality of Truccazzano accurately reflects two important elements of different nature: one historical and one territorial. The first refers to the existence of some medieval ruins in the area, consisting of the remains of an old defense and watchtower located near the Adda River. The second, however, is represented by the desire to highlight the existence of the three hamlets of Albignano, Cavaione, and Corneliano Bertario. The old medieval tower is represented with the heraldic figure of the red tower; the three hamlets of the Municipality are represented with three blue stars. The heraldic terms "aperto" and "finestrato del campo" indicate, respectively, that the gate and windows of the tower are open, thus allowing the background color of the shield to be seen. In this regard, it should be noted that in the coat of arms used by this Municipality, the red tower, rather than being—as it should be—open and with windows of the field, is instead closed and with black windows.