TYPO3 Fluid: Get link to root page

Get the root page ID:

<v:menu rootLineAs="rl"><f:debug>{rl.0.uid}</f:debug></v:menu>

Get a link to the root page ID:

<v:menu rootLineAs="rl">
    <f:link.page pageUid="{rl.0.uid}">Homepage</f:link.page>
</v:menu>