Civil flag of Serbia. It was also used as the flag of the <a href="https://en.wikipedia.org/wiki/Principality_of_Serbia" class="extiw" title="w:Principality of Serbia">Principality of Serbia</a>, between 1835 and 1882.
National Assembly of the Republic of Serbia (Serbian Parliament)
2006-11-11
<a rel="nofollow" class="external text" href="http://www.parlament.gov.rs/national-assembly/important-documents.531.html">Symbols</a>. National Assembly of Serbia.