Year 1644 (MDCXLIV) was a leap year starting on Friday (link will display the full calendar) of the Gregorian calendar and a leap year starting on Monday of the 10-day slower Julian calendar.

Antonio Stradivari (1644 – 18 December 1737) was an Italian luthier and a crafter of string instruments such as violins, cellos, guitars, violas, and harps. Stradivari is generally considered the most significant and greatest artisan in this field. The Latinized form of his surname, Stradivarius, as well as the colloquial, "Strad", is often used to refer to his instruments. It is estimated that he made 1,000 to 1,100 instruments and that around 650 of these instruments have survived including 450 to 512 violins.

Stradivari's ancestry consisted of notable citizens of Cremona, dating back to at least the 12th or 13th century. The earliest mention of the family name, or a variation upon it, is in a land grant dating from 1188. The origin of the name itself has several possible explanations; some sources say it is the plural of Stradivare, essentially meaning "toll-man" in a Lombard variety of Italian, while others say that the form "de Strataverta" derives from "Strada averta", which, in a Cremonese dialect of Italian, means "open road".