Simplify the following text for a Grade 10 native English-speaking person.
Original: Saint Mesrop Mashtots ( also Mesrob , Mashtotz , ) ( 361 or 362 â `` February 17 , 440 ) was an Armenian monk , theologian and linguist .
Simplified: Saint Mesrop Mashtots ( 360 - February 17 , 440 ) was an Armenia monk who invented the Armenian alphabet in the year 406 .