As if you needed more reasons to pray the Rosary, have you heard of the Blessed Virgin Mary’s 15 promises for those who pray it regularly?
When the Blessed Mother appeared to St. Dominic and gave him the Rosary devotion, she also gave him these 15 promises of spiritual benefits for those who pray it.
At least that’s the story. As historians have pointed out since the 17th century, there’s no evidence of this story prior to the 15th century, when it was popularized by Bl. Alanus de Rupe.
Did Alanus just make it up? Was he confused by something else? Or did he have a source that has since been lost to us? It’s hard to tell.
Note that even if the promises were given by the Blessed Mother to St. Dominic, they would still fall into the category of “private revelation,” or something that’s not a part of public divine revelation and that Catholics are not obliged to believe.
Either way, these promises could still be taken as inspiration for praying the Rosary.