Has Greece always been a parliamentary republic government?

While democracy was invented by the Greeks and is highly valued in Greek society and culture, Greece has had many undemocratic governments, and for most of its history was a monarchy of some type (the last monarch, Constantine, abdicated in 1967). Modern Greece suffered through several dictatorships who rejected the idea of parliamentary democracy, like that of Metaxas in the 1930s and a military junta from 1967-74. In addition, the Greek government of the 1940s and 1950s, while observing all the forms of democratic parliamentary monarchy, was in substance a pseudo-democratic oligarchy.