The Barbarians will boast 1,018 international appearances between their 27-strong tour squad when they arrive at the Kingspan Stadium next week.
Former Ulster back Timoci Nagusa will make his return to Belfast, having spent two seasons with the province from 2008-10, when he made 30 appearances and scored eight tries.
The side will take on Ulster next Thursday, June 1, after they play England at Twickenham on Sunday May 28.
The other headline additions to the famous invitation side include prop WP Nel (Edinburgh & Scotland), fly half Ian Madigan (Bordeaux Begles & Ireland), hooker Schalk Brits (Saracens & South Africa), and wings Horacio Agulla (Castres & Argentina) and Waisea Nayacalevu (Stade Francais and Fiji).
Also added to a stellar back division are Bath pair Kahn Fotuali'i and Robbie Freuan, Castres duo Rory Kockott and David Smith, and Nagusa's Montpellier team-mate Frans Steyn.
Joining the forward line-up are props Ben Franks (London Irish & New Zealand), Mike Ross (Leinster & Ireland), and Mikheil Nariashvili (Montpellier and Georgia), hooker Richard Hibbard (Gloucester and Wales) and uncapped Toulouse No 8 Gillian Galan.
The Barbarians' match against Ulster is the first time the sides have met since 1957 but the club enjoyed a successful visit to Belfast last November when they beat Fiji 40-7.
Tickets for the game at the Kingspan Stadium are on general sale now, priced £20 for adults and £12 for juniors.
BARBARIANS SQUAD: Backs: Horacio Agulla (Castres & Argentina), Adam Ashley-Cooper (Bordeaux Begles & Australia), Yann David (Toulouse and France), Kahn Fotuali'i (Bath Rugby & Samoa), Robbie Freuan (Bath Rugby), Rory Kockott (Castres & France), Ian Madigan (Bordeaux Begles & Ireland), Timoci Nagusa (Montpellier & Fiji), Waisea Nayacalavu (Stade Francais & Fiji), Ruan Pienaar (Ulster & South Africa), David Smith (Castres), Frans Steyn (Montpellier & South Africa).
Forwards: Patricio Albacete (Toulouse & Argentina), Steffon Armitage (Pau & England), Schalk Brits (Saracens & South Africa), Thierry Dusautoir (Toulouse & France), Corey Flynn (Star RFC & New Zealand), Ben Franks (London Irish & New Zealand), Gillian Galan (Toulouse), Richard Hibbard (Gloucester & Wales), Facundo Isa (Lyon & Argentina), Census Johnston (Toulouse & Samoa), Mikheil Nariashvili (Montpellier & Georgia), WP Nel (Edinburgh & Scotland), Mike Ross (Leinster & Ireland), Joe Tekori (Toulouse & Samoa), Jeremy Thrush (Gloucester & New Zealand).