Lucas Geralis was born on the island of Mytelene and died in Athens.

He attended his first drawing lessons in Smyrna under Theodoros Antoniadis and in 1896 he enrolled at The School of Fine Arts, Athens, where he studied painting under Georgios Jakobides, Nikiforos Lytras and Georgios Roilos.

His work belongs to the sphere of academism with influences from realistic and impressionistic movements of the nineteenth century.

Geralis held his first solo exhibition in Athens in 1911 and participated in a number of group exhibitions such as the 1911 International Rome Exhibition, and the 1934 Venice Biennale and so on.

His work is found in many public and private collections, notably: The National Gallery, Athens, The Athens Municipal Gallery, The Leventis Gallery, Nicosia, The Koutlides Collection and The National Bank of Greece.