Ireland has a long history dating back thousands of years. Key events include the arrival of Celts in 700 BC who dominated for 2000 years, Viking invasions and settlements starting in the 9th century, English invasion and rule starting in 1170, and eventual independence in the 20th century. The island has a mix of landscapes from green fields to rocky coasts and bogs. Notable in Irish culture are its storytelling tradition and influential writers. The economy has transformed from agriculture-based to one of Europe's wealthiest.