 The Conquistadors and Spanish settlers then brought some vividly marked horses to the Americas when they first arrived in the early 16th century.One horse with snowflake patterning was listed with the 16 horses brought to Mexico by Cortez, and additional spotted horses were mentioned by Spanish writers by 1604.Others arrived in the western hemisphere when spotted horses went out of style in late 18th-century Europe, and were shipped to Mexico, California and Oregon.