::
Anticipa il \mainmatter:
`\documentclass[a4paper,11pt,oneside]{book}
\usepackage[italian]{babel}
\begin{document}
\frontmatter
\tableofcontents
\mainmatter
\chapter*{Introduzione}
\addcontentsline{toc}{chapter}{Introduzione}
Bla bla..
\chapter{Alessandro}
Bla bla..
\end{document}`
