Andreas Syngros

Born in Istanbul to Chiot parents who left the island due to the Massacre of Chios, Syggros was one of the founders of the Bank of Constantinople along with Stephanos Skouloudis. Syggros married Iphigenia Mavrokordatou of the wealthy merchant Mavrocordatos family; they never had any children. They moved to Athens in 1871 where Syggros planned to found a new bank. Buying land from the widow of Dimitrios Rallis, Syggros engaged the well-known Athenian architect Nikolaos Soutsos who built his home based on plans by the German Ernst Ziller, across from the Royal Palace. Today the mansion is the headquarters of the Greek Foreign Ministry, having been left to the state by his widow.

He, together with other members of the Constantinople Greek diaspora and the Odessa Greek diaspora, led by Evangelis Valtatzis, founded the General Credit Bank (Ethniki Pistotiki Trapeza).

In 1873, he profited from the stock market scandal that followed the Lavreotika dispute, having previously raised the price of the Greek Company of Lavrion Mines stocks by maintaining or spreading false rumors about the existence of gold reserves in the mines.

In 1882, he founded the Privileged Bank of Epirothessaly in Volos to help the economy of the newly annexed Greek territories of Epiros and Thessaly. The annexation led to an influx of investment from expatriates who bought large estates previously belonging to Muslims who had made investments in the area. The "Privileged" in the bank's name refers to the bank receiving the right to issue banknotes in these territories. The National Bank of Greece acquired the bank after Syggros's death.