The national flag of the Principality of Andorra was adopted in 1866. The flag is a vertical tricolor of blue, yellow, and red with the coat of arms of Andorra in the center. The design is based on the flags of France and Spain, the two states that protect the independence of the small state. The design of vertical bars is taken from the French Tricolore, as is the blue and red. Yellow and red are taken from the Spanish flag; from 1806 to 1866, Andorra's flag had been a vertical bicolor of yellow and red.