Groups of cardinals: 100 close to 150 a 5 8 and 6 for starters (9)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

C (Roman numeral for 100) + ON (close to) + CL (Roman numeral for 150) + A + V (Roman numeral for 5) + ES ( first letters [for starters] of each of E IGHT and S IX)