
The planet Belsavis.
Belsavis was the location of a secret Jedi enclave that housed many younglings after the Jedi Purge. It was led by the Ho'Din Master Plett. Callista Ming and her lover Geith protected the enclave from the Eye of Palpatine.
After the Eye was no longer a threat, Plett led all the Jedi that were left and headed to secret coordinates that Nathaniel Kenobi had given them.