Who invented rosary? Where do today's prayers of the Rosary come from? The spread of the rosary can probably be traced back to the Crusades and the return of the knights from the Middle East in the 11th century. The inhabitants of Palestine at that time (mainly Muslims) were famous for their rhythmic, repetitive prayers, measured by a string with beads.
Prayer cords also existed in other religions, i.e. in Buddhism and Hinduism. The construction and number of beads of those cords were very similar to today's rosaries. Christian knights, being inspired by the simplicity and universality of prayer cords in all social strata of a given religion picked up this idea. In addition, the growth of Marian devotion in those days may have been influenced by the fact that the very rosary was dedicated to this very figure. Jakob Sprenger (the Inquisitor), a Dominican, co-author of the work The Hammer for Witches and founder of the 1st Rosary Brotherhood in Cologne, added the Our Father and the Creed at the end of each tenth of the Hail, recited at each of the 15 mysteries.
This is how the rosary, known as the Marian or Dominican rosary, came into being. Thus the very idea of the rosary chaplet comes from the Middle East, but the formation of the rosary in the form in which we know it today is a completely different story, but also associated with chivalry and the ubiquitous cult of Mary. Thus the tradition of praying the rosary itself is very long, but over many decades its importance has not diminished even minimally.