Flag of Gran Colombia

The flag of Gran Colombia was based on Francisco de Miranda's tricolour, which served as the national flag of the First Republic of Venezuela. The general design of the Gran Colombian flag served as the model for the current flags of Venezuela, Colombia and Ecuador, which emerged as independent nations at the breakup of Gran Colombia in 1830.

First flag of Gran Colombia, 1819–1820. Stripe ratios 2:1:1

Second Flag of Gran Colombia 1820–1821. Stripe ratios 2:1:1

Third Flag of Gran Colombia 1821–1822. Stripe ratios 1:1:1

Fourth Flag of Gran Colombia 1822–1830. Stripe ratios 1:1:1

The first flag was adopted in late 1819. Originally used without arms, the first design of the state flag was based on the Venezuelan flag of 1811. Some variations have the coat of arms in the centre of the flag. This flag was in use officially until 10 January 1820.

On 10 January 1820, the Department of Cundinamarca, one of the three official departments of the republic, adopted arms of its own alleging that the arms of the republic were only used in Venezuela. On 12 July 1821, the national congress decreed that the arms of Cundinamarca must be used on the common flag as part of the national coat of arms, until new arms could be decreed. Thus, the departmental flag of Cundinamarca was converted into the national flag of Gran Colombia, and was officially used in the department of Venezuela. Some variations have the coat of arms in the centre of the flag. It would be the national flag till late 1821.

A third flag was adopted in late 1821, with a different coat of arms. Some variations have the writing "Republica de Colombia" around the coat of arms, and others have the coat of arms encircled.

On 11 July 1822 Guayaquil was incorporated and Gran Colombia reached its largest size. New arms were adopted, and the coat of arms was taken off the flag, and replaced with stars. It had three stars, but was upped to six, then nine, then finally twelve. Some variants had no stars, however. The color of the blue stripe was also changed to the dark blue seen on the flags of its successors. This flag served as the national flag until the country's dissolution in 1830. Some variants have no star.

...
Wikipedia