Simplify the following text for a Grade 7 native English-speaking person.
Original: Year 1703 ( MDCCIII ) was a common year starting on Monday ( link will display the full calendar ) of the Gregorian calendar and a common year starting on Friday of the 11-day slower Julian calendar .
Simplified: The year 1703 ( MDCCIII ) started on a Monday , ( or a Thursday by the 11-day slower Julian calendar ) .