From Nxt/Ardor slack:

We are pleased to provide an early announcement with the Ardor community. Ardorgate (www.ardorgate.eu), and the AEUR child chain is now live and will be officially announced on Monday! This new child chain token, AEUR, is directly pegged to the Euro, and provides a quick and simple way for users to purchase cryptocurrency using a Mistertango (www.mistertango.com) account.