thumb|The cathedral atop the Rock of Cashel in Ireland was completed in 1270.Year 1270 (MCCLXX) was a common year starting on Wednesday of the Julian calendar, the 1270th year of the Common Era (CE) and Anno Domini (AD) designations, the 270th year of the 2nd millennium, the 70th year of the 13th century, and the 1st year of the 1270s decade.
thumb|The cathedral atop the Rock of Cashel in Ireland was completed in 1270.Year 1270 (MCCLXX) was a common year starting on Wednesday of the Julian calendar, the 1270th year of the Common Era (CE) and Anno Domini (AD) designations, the 270th year of the 2nd millennium, the 70th year of the 13th century, and the 1st year of the 1270s decade.