A Jedi Consular was the title of one of three distinct schools of thought which a member of the Jedi Order

Jedi Order Organization Galaxy-Wide Organizations

could decide to study under following their ascension to the rank of Jedi Knight, the other two being Jedi Guardian

Jedi Guardian Miscellaneous Roles

and Jedi Sentinel. Led by the Council of Reconciliation, the Consulars sought diplomatic measures in spreading peace and harmony across the Galactic Republic. Refraining from drawing their lightsabers (many Consulars wielded green lightsabers) except as a measure of last resort, Consulars spent a great deal of time studying the mysteries of the Force. A Consular's role in the Jedi Order had remained largely consistent throughout its history but was first written down by the Consular Jedi Seer

Jedi Seer Miscellaneous Roles

Sabla-Mandibu in the text The Jedi Path: A Manual for Students of the Force.