Flag Day: 2 May
The flag of the Pontifical Imperial State of Rome-Ruthenia reflects the rich history and diverse heritage of this unique entity, an ecclesiastical state without borders.
The outside half of the flag is divided into the upper part in white and the bottom part in equal bands of blue and red, coming from the Pontifical Kingdom of Ruthenia (itself derived from the pan-Slavic colours).
The inside half of the flag is based on the colours of Rome and the Roman State, yellow and red. Together these four colours have long been associated with the pontifical imperial household. On the yellow portion is the iconic double-headed pontifical eagle.
The personal flag of the Prince-Bishop of Rome-Ruthenia is identical, with the addition of pontifical insignia on the white and blue portion.
When displayed as a square flag, the yellow portion (called a canton) is reduced in size and is above the blue stripe.
When displayed longer than the proportion of 3 × 5, the yellow portion extends over the blue stripe and ends at the top of the red stripe, while retaining the same width used in the 3 × 5 flag.