The incorporation of the colour green into the national flag of Portugal marked a significant departure from tradition and reflected a notable shift inspired by republican principles.

The current flag design represents a break from the prior standard, which was intimately linked to the royal arms and showcased blue and white.

Recommendations are listed below:[3] Although the colours red and green were not originally part of Portugal's national flag until 1910, they were present in various historical banners during significant periods.

Additionally, a green background version of the banner was popular during the 1640 revolution that led to Portugal's independence from Spain.

[5] Additionally, green was the colour that Auguste Comte had designated to be present in the flags of positivist nations, and this ideal was incorporated into the republican political matrix.