 As such, historian Richard Gerberding, has suggested a different chronology and reading of the "LHF", that places Sigibert's death on 1st February 651.According to Gerberding narrative, Grimoald and Dido organised around 16th January 651 Dagobert's exile to Ireland at Nivelles, then when Sigiberts died a month later they acted out the plan and tonsured Dagobert, replacing him with Childebert whom then ruled until 657.Clovis II then immediately acted and invaded Austrasia, executing Grimoald and his son.