Try adding the line inside \titles argument:
\title{\line(1,0){250}\\A Title\\\line(1,0){250}} Code:
\documentclass{article} \begin{document} \title{\line(1,0){250}\\A Title\\\line(1,0){250}} \author{FirstName LastName} \maketitle \clearpage \end{document} 
Same with titling package:
\documentclass{article} \usepackage{titling} \begin{document} \pretitle{% \begin{center}\LARGE \rule{3in}{0.4pt}\par } \posttitle{\par\rule{3in}{0.4pt}\end{center}\vskip 0.5em} \title{A Title} \author{FirstName LastName} \maketitle \clearpage \end{document}