Removing P tag's in rich text area's
Seems like a simple striptags filter would do nicely in this case:

&lt;h1&gt;{{ entry.titleField|striptags('&lt;strong&gt;&lt;em&gt;&lt;br&gt;')|raw }}&lt;/h1&gt;


If you're having issues with linebreaks, you might want to add the nl2br filter as well:

&lt;h1&gt;{{ entry.titleField|striptags('&lt;strong&gt;&lt;em&gt;&lt;br&gt;')|raw|nl2br }}&lt;/h1&gt;