Plovdiv reached an agreement that the Principality of Bulgaria and Eastern Rumelia had a common government, Parliament, administration, and army. Today 6 September is celebrated as the Unification Day and the Day of Plovdiv. After the unification, Plovdiv remained the second most populous city in Bulgaria after the capital Sofia. The first railway in the city was built in 1874 connecting it with the Ottoman capital, and in 1888, it was linked with Sofia. In 1892 Plovdiv became host of the First Bulgarian Fair with international participation which was succeeded by the International Fair Plovdiv. After the liberation, the first brewery
Church of the Holy Mother of God, Plovdiv 10 January 1860 the bishop of Plovdiv Paisius held a service in Bulgarian language and publicly announced that his congregation denounced the Greek Patriarch of Istanbul which became a great scandal and Plovdiv became the most radical center for the struggle of the autonomy of the Bulgarian Orthodox Church. On 30 April Paisius organized a Church and People's counsel in which the citizens were also represented in order to discuss the church question. Plovdiv sent a delegation to the Ottoman government asking officially for an autonomous Church. That Counsel was held annually until 1870 when the Bulgarian Exarchate was recognized