[3] Konstantin, nicknamed Kosta, was born on 22 November 1874 in Belgrade, to Hermina, née Gruber, and Dimitrije Kumanudi.

He then moved to Paris where he graduated at the École Libre des Sciences Politiques, also obtaining his PhD there in 1901.

He and Slobodan Jovanović published Basics of the public law in the Kingdom of Serbia, Volumes I & II, in Belgrade in 1907 and 1909.

[4] His other legal works include International law among the South Slavs (1896; expanded translation of the lengthy study by Milenko Vesnić), Alliance treaties in the 19th century (1901), Administrative law (1909; 1920), Our jurisprudence, Tirgo, Legal position of the resigning ministers, View on Austrian role in the eastern question, etc.

He was a contributor to the Serbian Literary Herald, Nova Evropa, Arhiv, Branič and other papers and magazines.

[5] He held numerous ministerial tenures in the newly created Kingdom of the Serbs, Croats and Slovenes, which was later renamed Yugoslavia.

[5][7] As a finance minister, he drafted the first budget adopted in the Kingdom of the Serb, Croats and Slovenes parliament.

He concluded the massive internal loan (500 million dinars at the time) in 1921 and promulgated the law on the tax equalization in 1922.

[6] He especially gained good reputation during his position as the finance minister, because of the highly favorable 1922 Blair loan in America, worth $100 million.

The debates and criticism ensued, including various women organizations, who protested against the sculpture of a fully naked man in city center.

"Pobednik", sculptured by Ivan Meštrović, was defended by numerous members of Serbian academia, like Bogdan Popović, Stevan Hristić, Branislav Petronijević, Ksenija Atanasijević, Zora Petrović, Beta Vukanović or Stanislav Krakov, but also from certain women organizations and parts of the church.

[5] Still, the Arts Commission, formed by the city, decided in September 1927 to relocate the monument and place it "on the ridge of the Belgrade Town, at the mouth of the Sava and the Danube".

He was tried as part of the Belgrade Process and declared a "member of the pro-Fascist Yugoslav Radical Union, an extreme fascist and signer of the Nedić's Appeal".

A year later, he was arrested again and accused of "joining the foundation of an illegal board in August 1948 in Belgrade, with the goal of rounding up of the elements hostile to the state and social organization".

He was even taken by the UDBA, the secret police, to their special section which dealt with the comments of the daily press, communiques, estimate of the political situation in the world, etc.