L. Junio Bruto duce,populus Romanus iuravit se nec Tarquinium nec alium regem regnare passurum esse.
translation: With Lucius Junius Brutus being made the leader, the Roman people swore that it would allow neither a Tarquin nor another king to rule. I used the word ‘it’ because passurum is neuter but se reflects back to populus Romanus which is masculine. So maybe my translation is lacking somewhere?
passurum is accusative-singular-masculine in agreement with se (referring back to populus) which is the accusative subject of the accusative-infinitive (here future) clause. However, English wants “they” here unless you render populus with “populace” which would take “it”.
Sorry for the double post, I don’t know how to delete the other one. 
passurum is accusative-singular-masculine in agreement with se (referring back to populus) which is the accusative subject of the accusative-infinitive (here future) clause. However, English wants “they” here unless you render populus with “populace” which would take “it”.
I forgot that masculine accusative is -um as well as neuter.
How would the sentence be worded if one wish to say…“that neither a Tarquin king nor another king would be allowed to rule.”