The subject and the colors in the coat of arms of the municipality of Legnano are linked to a legend. In an unspecified historical period, in today's "Piazza San Magno", a large Turkey oak. On the day of the patron saint san Magno, November 5, a farmer began to contemplate the tree admiring its ability to withstand frost and snow. The farmer thus expressed a desire to be able to withstand the difficulties of life in the same way. At that moment, san Magno appeared, offering to satisfy man's desire by giving him the vigour, recklessness, and power of a lion.