Magento 1 parent category
<?php $currentCategory = Mage::registry('current_category'); ?>
<?php
if($currentCategory->getLevel() == 2){
$currentCategory = $currentCategory;
} else {
$parentCategory = Mage::getModel('catalog/category')->load($currentCategory->getParentId());
}
?>
<div class="block block-account block-category">
<div class="block-title"><strong><span><?php if(!empty($parentCategory)){echo $parentCategory->getName();}else{ echo $currentCategory->getName();}?></span></strong></div>