simple ultimate parent title

modx-up-title

<?php
//4 levels deep
$title = '';

//first level parent
$parentId = $modx->resource->get('parent');

if($parentId == 0){
    $title = $modx->parseChunk('interior-title', array('title' => $modx->resource->get('pagetitle') ));
    return $title;
} else {
    //its not the root, go again
    $parentObj = $modx->getObject('modResource', $parentId);
    $gId = $parentObj->get('parent'); 
}

if($gId == 0){
    $title = $modx->parseChunk('interior-title', array('title' => $parentObj->get('pagetitle') ));
    return $title;
} else {
    //its not the root, go again
    $gObj = $modx->getObject('modResource', $gId);
    $ggId = $gObj->get('parent');
}

if($ggId == 0){
    $title = $modx->parseChunk('interior-title', array('title' => $gObj->get('pagetitle') ));
    return $title;
} else {
    //its not the root, go again
    $ggObj = $modx->getObject('modResource', $ggId);
    $gggId = $ggObj->get('parent');
}

if($gggId == 0){
    $title = $modx->parseChunk('interior-title', array('title' => $ggObj->get('pagetitle') ));
    return $title;
}