Emperor Monmu
The early years of Tenmu's reign are not linked by scholars to any era or "nengō". The Taika era innovation of naming time periods – "nengō" – was discontinued during these years, but it was reestablished briefly in 686. The use of "nengō" languished yet again after Tenmu's death until Emperor Monmu reasserted an imperial right by proclaiming the commencement of Taihō in 701.