Antoon van Tsestich, Latinized Antonius Sexagius[1] (died 1585) was a lawyer and author in the 16th-century Low Countries.
Tsestich was an advocate in the Great Council of Mechelen, the highest law court in the Habsburg Netherlands.
He died in Mechelen on 10 September 1585.
[2] Tsestich wrote a work on Dutch orthography, Orthographia Linguae Belgicae, sive de recta dictionum Teutonicarum scriptura, secundum Belgarum, praesertim Brabantorum, pronuntiandi usitatam rationem (Leuven, Joannes Masius, 1576),[3] and edited Filips Wielant's work on civil litigation, Pracktijke Civile des edelen heere M. Phylips Wielant (Antwerp, Hendrick vander Loe, 1573).
[4] The latter was reprinted in Rotterdam in 1613.