This article discusses the chronology of the ancient South Arabian inscriptions during the first four centuries A. D., according to their palaeography.In the first place, scrutinizing palaeographically the inscriptions whose period and provenance are certain, the author tries to show the following things.(1) As J. Ryckmans suggested, the graphical differences don't always signify the differences of period, but can correspond with the differences of provenance. For example, in the inscriptions found in Himyar, we already find at the end of the 2nd century, evolved forms of “b”, “w”, “f”, which appear for the first time in the latter half of the 4th century in Saba.(2) In Saba, “t” appears in the shape of italic “x” instead of roman “x” from ca. 100 to the end of the 3rd century.(3) We should rather compare the graphical evolution of Hadrami inscriptions with that of Himyar than that of Saba.In the next place, scrutinizing palaeographically some inscriptions containing the kings' names not yet identified, the author tries to arrange them chronologically.Hamilton 8… in the latter half of the 1st cent.?RES 4708… at the beginning of the 2nd cent.Ingrams 1; RES 3910, 4196, 4912, 4938; Ja 648, 651; CIH 407… at the beginning of the 3rd cent.RES 4913, 4914, 4915… in the 1st half of the 3rd cent.RES 4909, 4910… in the middle of the 3rd cent.RES 4698 (?), Ry 591… in the latter half of the 3rd cent.RES 4230, Ja 652… at the end of the 3rd cent.CIH 430, 569… at the beginning of the 4th cent.RES 3960… in the 1st half of the 4th cent.