What is the significance of including “under Pontius Pilate” as part of the Creed?

The mention of the ruler of that time affirms the historical reality of the crucifixion of Christ. The story of the suffering and crucifixion of the Lord Christ in the era of Pontius Pilate is a true story, which the believers live throughout their daily lives, and which will remain alive till the day of the second coming of the Lord.