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Salvius ad Societātem Potentium sē iungit

ōlim Gāius Salvius Līberālis erat iuvenis doctus, sed etiam stultus, quī cōnstituit Rōmam movēre. ibī Salvius erat nōtus in basilicā ob dictiōnem; vērē poterat nihil dīcere, sed bonus appārēre. mox tamen voluit senātor esse et virōs potentēs, quī poterant eum adiuvāre, invēnit. virī potentēs prō imperātōre Vespasiānō labōrābant. virī etiam prō Marcō Maecēnāte, quī eō tempore Rōmae aderat, labōrābant. in Cūriam intrāvit et mox imperātōrī occurrit. imperātor Vespasiānus voluit Salvium ad Britanniam īre et Gnaeum Iūlium Agricolam, quī in illō locō pūgnābat, administrāre.

Marcus autem cōnsilium alium habuit. Agricola, quī populō favet, Marcum nōn dēlectāvit quod erat nōtissimus. itaque Marcus Salvium in Societātem Potentium indūxit et ad Britanniam mīsit. Marcus nōn cupīvit Agricolam potentiōrem esse. Salvius erat laetissimus quod potentia eum valdē dēlectāvit.

Latin nouns have three genders: masculine , feminine, and neuter.
There are exceptions, but in general the following rules apply:

Nouns with the nominative ending -us are masculine.
Nouns with the nominative ending -a are feminine.
Nouns with the nominative ending -um are neuter.

Adjectives must agree in gender (and case and number) with the noun which they describe.

bonōs puerōs vīdī : I saw the good boys.
bonās puellās vīdī : I saw the good girls.

In the first sentence, bonōs is accusative, plural, masculine to agree with puerōs.
In the second sentence, bonās is accusative, plural, feminine to agree with puellās.

Be sure to review information about gender in this short video from latintutorial.com.

Operatives, we have accessed the following information on Salvius:  

Gāius Salvius Līberālis, a Roman aristocrat, is known only from a surviving funerary inscription.

Presumably Salvius was born in Italy at some point in the 1st century AD and most likely moved to Rome. He would have been trained in the standard upper-class Roman educational system, destined for public life. After a successful career as a lawyer, he probably went through the cursus honōrum, eventually becoming a senātor. Based on his epitaph, at some point he was chosen as one of the Arval brotherhood, a group of twelve men who met regularly to perform religious ceremonies and to pray for the Emperor and his family.

Salvius was also placed in a civic office. It is possible that the Emperor Titus sent him to help Agricola, the governor of the Roman province of Britannia. He was to look after affairs of the province while Agricola was away fighting in the north.

It is unknown at this time if the TSTT recreation of Salvius has sworn allegiance to the Societās Potentium.