Site explored by Thomas Arnaud.

Sanctuary explored by Joseph Halevy.

Eduard Glaser describes the site in detail, recording four important monumental inscriptions along the wall.

Nazih al Azm takes first photographs of structure.

Egyptian archaeologist Ahmen Fakhry visits site and builds on Glaser's description of the site, photographs it and copies more inscriptions.

An expedition, led by American archaeologist Wendell Phillips. begins excavation of the sanctuary.

Excavation of sanctuary ceases completely, team forced to flee due to threats to their security.

Yemen Arab Republic founded.

People's Republic of South Yemen formed, changing its name two years later to the Democratic Republic of Yemen. In the north — the Yemen Arab Republic remains.

Archaeological and epigraphic research resumes around Ma'rib area but no work done at Mahram Biqis.

Civil war breaks out in the Yemen Arab Republic.

United Republic of Yemen established.

Power struggle within the nation lead to civil war again. Country again reunified under President Saleh. Since that time Yemen embarks on program of modernization.

Preliminary archaeological research resumed at Mahram Biqis.

The American Foundation for the Study of Man conducts its first field season of renewed excavation and documentation at the sanctuary.