5 surviving letters between Libanius and Siburius, correspondent of Libanius, spanning 390 AD.
Libanius celebrates Siburius' letter and hopes it will begin a steadier correspondence.
Libanius asks Siburius to complete his promise and relieve Euthymius' poverty.
Libanius urges Siburius to act against wrongdoers who harmed Iamblichus.
Libanius asks for either completion or credible hope in Julian's matter.
An appeal for fair treatment of Priscianus during Siburius' Palestinian administration.