A Twig extension for converting roman to arabic numerals and vice-versa.
composer require emilmassey/twig-roman-numerals
For Symfony usage you'll want to add it as a service and tag it for Twig.
# config/services.yml
services:
twig.extension.roman_numerals:
class: EmilMassey\Twig\RomanNumerals\RomanNumeralsExtension
tags:
- { name: twig.extension }