HTML

<div id="contact-region"></div>

<script type="text/template" id="contact-template">
  <dl>
    <dt>Name</dt>
    <dd><%- name %></dd>
    <dt>Age</dt>
    <dd><%- age %></dd>
  </dl>
</script>

JavaScript

var Contact = Backbone.Marionette.ItemView.extend({
  el: '#contact-region',
  template: '#contact-template'
});

var Person = Backbone.Model.extend({
  defaults: {
    name: 'Alice',
    age: 20
  }
});

var person = new Person();
var contact = new Contact({
  model: person
});

contact.render();