The national flag of Monaco has two equal horizontal bands, red (top) and white (bottom), both of which have been the heraldic colours of the House of Grimaldi since at least 1339. The present bicolour design was adopted on 4 April 1881, under Charles III.
The flag of Monaco is graphically similar to the flag of Indonesia, with differences in their dimension ratios (Monaco's at 4:5 and Indonesia's at 2:3), and the shade of red is darker for the flag of Monaco. The flag of Poland is also similar to that of Monaco, but with the colours reversed – white on top and red on the bottom. The flag of Singapore also has a similar design and colour, with the exception being a crescent with five stars on the upper left side.
