In addition to notable architectural achievements, Petar Popović made a great contribution to Serbian heraldry and vexillology.
His family left Old Serbia (then under the Ottoman Empire) when he was a child and came to the north in Smederevo, where Petar received his primary education.
In 1919 Popović became head of the Ministry of Construction and Public Works as well as a professor of Medieval Serbian and Byzantine architecture at his alma mater, Belgrade University.
Except for architecture, Popović was also engaged in church interior decoration, restoration of buildings, urbanism, historiography, heraldry and vexillology.
[2] Although some of his projects (mostly private buildings as well as some public ones) were executed in an academic manner, Popović preferred the Morava style of Serbian medieval architecture for most of his works.