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Question revised: What must I do to make "Chapter 1" display as "CHAPTER I", "Chapter 2" as "CHAPTER II", and so forth?

Background and details: This is a requirement for my thesis. I've searched a good while but not been successful in finding what I need without messing up what I already have. I found in the Wiki (here) about choosing different chapter styles, however, none of those listed are what I need.

I need "CHAPTER" to display in all capitals, and to use roman numerals for the number of the chapter (not the page number though). And it must not change how I've (because of help from this awesome forum community) been able to get the page numbers in the correct places.

Other details that may be relevant:

  • I'm using LyX version 2.0.6.
  • Document class: book (Memoir).
  • Modules selected: Custom Header/Footerlines.
  • Page Layout -> Headings style: Default.
  • Not two-sided.
  • Margins: 4cm above, 3cm below, 4cm left, and 3cm right.
  • LaTeX Preamble:

    \copypagestyle{chapter}{plain} % make chapter a page style of its own

Question again: What must I do to make "Chapter 1" display as "CHAPTER I", "Chapter 2" as "CHAPTER II", and so forth?

Thank you for your time and any help you provide!

share|improve this question
up vote 5 down vote accepted

Without a minimal example it's difficult to say; but


should be all you need.

With memoir, there are several facilities one can exploit. Here's a solution that should accomplish your desires.


\usepackage{kantlipsum} % just for the example


\copypagestyle{chapter}{plain} % make chapter a page style of its own





\chapter{A title}




I added also a chapter in the front matter to show that the style is the same.

enter image description here

share|improve this answer
Thank you. "\renewcommand{\thechapter}{\Roman{chapter}}" worked in the LaTeX Preamble. "\renewcommand{\chaptername}{CHAPTER}" didn't work in the LaTeX Preamble, but did work after I placed it right before the first chapter in "TeX Code". "\renewcommand{\thechapter}{\Roman{chapter}}" has cause a problem, however, in that it makes other points in roman numerals as well (such as sections). That won't work. Is there a way to have the chapter numbers roman numerals, but the numbers in the sections and other places normal? – Elijah Mar 10 '14 at 10:01
For example, instead of this (image of how it is currently): i.stack.imgur.com/oLBBZ.png I need this: i.stack.imgur.com/sG8YZ.png – Elijah Mar 10 '14 at 10:02
@Elijah Yes, it's possible to have what you ask for, but seeing the LaTeX preamble is needed. Of course, LyX will just make things more difficult to implement. – egreg Mar 10 '14 at 10:05
All in my preamble at this time is in the original post, plus the two lines of code/commands(?) you've provided here. – Elijah Mar 10 '14 at 10:06
Works perfectly. Thank you! – Elijah Mar 10 '14 at 10:22

I'm not familiar with LyX and unfortunately I have problems installing it. However, your problem can be solved by redefining the chapter command.

Add the following to your preamble in LyX:


It will look something like this: Sample with Roman numerals

If you want small roman numerals, simply use \roman{chapter}.

share|improve this answer
titlesec isn't really compatible with memoir. – egreg Mar 10 '14 at 8:56
You don't need titlesec to redefine \thechapter. – Nicola Talbot Mar 10 '14 at 8:59
Thanks for comments, I altered the answer accordingly. – Dennis Mar 10 '14 at 9:18

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