I am in the same situation as the author of How can I display a short chapter name in the header and a long chapter name in the TOC but, in addition, I also want the starred version for the Epilogue: no chapter number anywhere.
Here is a MWE:
\documentclass[11pt]{book}
\begin{document}
\tableofcontents
\chapter{Un El'ephant}
\c ca trompe,
\chapter{Deux El'ephants}
\c ca trompent,
\newpage
\c ca trompent,
\chapter{Trois El'ephants}
\c ca trompent ...
\newpage
... 'enorm'ement.
\chapter*[SpryRogue]{Epilogue}\chaptermark{PiLog}
\newpage
Pas trop n'en faut.
\end{document}
addcontentslinebut didn't see anything that would explain what to put in\addcontentsline{toc}{ }{ }to make\chapter*[Spry Rogue]{Epilogue}\chaptermark{Pi Log}work (as it should). – schremmer Aug 06 '20 at 05:55SpryRogue]EpilogueHEADER: ChapNumber is previous ChapNumber instead of No ChapNumber but correct title! – schremmer Aug 06 '20 at 16:52\backmatterdeclaration is what you are looking for (and use\chapterwithout*). – Donald Arseneau Aug 06 '20 at 22:45