[2] Her father, Andreas Antoniadis, was a lawyer in Piraeus; while her mother, Efrosini Leli, belonged to a well-known family from Athens.

[2] In 1929 she was appointed as Chair in Early Christian, Byzantine and Modern Greek Language and Literature at Leiden University, succeeding Dirk Christiaan Hesseling.

[4] On 13 November she gave her acceptance speech to a crowded hall; present were the Greek Consul to Rotterdam, as well as the heir to the Dutch throne, Princess Juliana, who enrolled in Antoniadis' classes.

[3] In 1935 she was elected to a part-time professorship in Early Christian, Medieval and Modern Greek Language at the University of Leiden, replacing the Dutch Byzantine scholar N K Hesseling.

[2] During her time in Venice she contributed to the renovation of buildings such as the Flanginian School and San Giorgio dei Greci, where she founded a museum.

[8] Antoniadis' research explored the connections between Greek literature in the ancient, Byzantine and modern periods, with a particular focus on the place of liturgy.

[10][11] Her work included studies of Pascal's Bible translation, the Ptochoprodromika by the 12th-century Byzantine writer Theodoros Prodromos, as well as on Erotokritos and the Sacrifice of Abraham by an unknown Venetian-Cretan poet of the 15th century.