The tricolor was adopted on Nov. 9, 1918 as the national flag of Azerbaijan Democratic Republic (ADR) which existed for 23 months from 1918 to 1920.
Present-day Azerbaijan is considered the successor of the ADR, which claimed to be the first secular and democratic Muslim-majority country.
"The flag once raised will never fall!" became the motto of the country's independence struggle in the 20th century. They were the words of Mammad Amin Rasulzade, a statesman, prominent public figure and a founder of ADR.