A Greek archaeologist has announced at a conference in Thessaloniki on Thursday that he has excavated the tomb of Aristotle.

In the said conference commemorating the 2,400th anniversary of Aristotle’s birth, Konstantinos Sismanidis says that he has “no proof but strong indications, as certain as one can be,” to strengthen his claim about the discovery.

“We had found the tomb,” he said, according to the New York Times. “We’ve now also found the altar referred to in ancient texts, as well as the road leading to the tomb, which was very close to the city’s ancient marketplace within the city settlement.”

The tomb, Sismanidis says, was in a structure that was exhumed in the ancient village of Stagira located 40 miles east of Tessaloniki, which is where Aristotle was born. He added that the monument’s structure was established in Aristotle’s honor after he died in 322 B.C.

Greek archaeologists who have been working to unearth the tomb of Aristotle consider the unearthing of the tomb as the most important finding from the excavation that has gone on for over 20 years.

Aristotle was believed to have died in Chalcis, Evia and was buried there as well. However, two literary sources have suggested that the people from Stagira may have transferred his remains to his birthplace, according to Greek Reporter.

The tomb’s public character is evident by its location alone. The archaeologists also pointed to its construction that appears to have been rushed and then covered with quality materials later on. The tomb also has a square-shaped floor and an altar on the outside.

Several of its characteristics estimated to be apparent at the start of the Hellenistic period “all lead to the conclusion that the remains of the arched structure are part of what was once the tomb-shrine of Aristotle,” Sismanidis said.

The Hellenistic period began after the death of Alexander the Great, the most famous student of Aristotle, in 323 B.C.