Ralpacan'
...that the Tibetan Empire reached its greatest extent under Ralpacan's rule from 815 to 838 CE?
...that the <a href="./History_of_Tibet#The_Tibetan_empire" id="mwFiw" rel="mw:WikiLink" title="History of Tibet">Tibetan Empire</a> reached its greatest extent under <b id="mwFi0"><a href="./Ralpacan" id="mwFi4" rel="mw:WikiLink" title="Ralpacan">Ralpacan</a>'</b>s rule from 815 to 838 CE?