Correct semantic html5 tag for single top level nav and sub links

Correct semantic html5 tag for single top level nav and sub links

I have the following structure for navigation:
Models
Model 1
Model 2
Model 3
Model 4
I would like to use the nav tag since this is the main navigation on the site
I cant also decide about what tag "Models" should be in. Is it a title
within a nav tag - im not sure thats correct?
I therefore have the following so far but am unhappy with it -
particularly the title part:
<nav>
<h1>Models</h1>
<ol>
<li><a href="#">Model 1</a>
<li><a href="#">Model 2</a>
<li><a href="#">Model 3</a>
<li><a href="#">Model 4</a>
<li><a href="#">Model 5</a>
</ol>
</nav>