Archaeologists in northern Greece have found a tomb that they consider to be having connection with the reign of warrior-king Alexander the Great and the tomb dating between 325-300 BC, officials said on Tuesday.

Prime Minister Antonis Samaras visited the tightly-guarded site on Tuesday said the discovery is very important.

Alexander the Great, who started building an empire from the northern Greek region of Macedonia stretching as far as India, died in 323 BC and was buried in Egypt. The fellow royals of Alexander were buried in a cemetery near Vergina, where the tomb of Alexander's father, Philip II, was found in the 1970s.

The un-looted Amphipolis grave, which is enclosed by unexpectedly long and well-built wall with marble decorations, may be of senior ancient official, according to archaeologists.

Excavator Katerina Peristeri has argued that the mound was firstly covered by a large stone lion that was discovered a century ago about five kilometers from the site. In the earlier period, the lion has been connected to one of Alexander's military commanders, Laomedon of Mytilene and who became governor of Syria after the king's death.

"The excavation will answer the crucial question of who was buried inside", Samaras said. It is expected that tomb will be opened in the next two weeks.

On Tuesday, police guards were mounted around the fenced-off mound where the earth-moving machinery was shifting tons of dirt from the excavation.