1. Casca lives with the Lombards across the Alps for a while, but wars break out with rival tribes, especially the Gepids and Avars, and Byzantine intrigue results in the Lombards crossing the Alps en masse and settling in northern Italy, driving out the Byzantine armies.  Casca is reunited with an old friend and learns that Narses is alive in Naples.  Leaving the Lombard tribe he seeks final revenge for Ireina's death.  Afterwards, he crosses the sea to Egypt and spends time there discovering the old pharaoic empires, meeting and then living with a woman called Ayesha.  But when they near Alexandria, they are captured by the Brotherhood.

Casca is given a choice; to join the Brotherhood in retaking the Spear from the Persians, or watch Ayesha being slowly killed.  He has no choice but to obey and joins the Byzantine army of Heraclius that is at war with the Persians.  After a few years of campaigning Casca manages to recover the spear and travels via Antioch to Jerusalem where the Brotherhood is now based.  But both Casca and the Brotherhood have played a double-cross and Casca leaves, once again embittered and alone.

Casca meets Mohammed - mentioned in The Assassin and The Conquistador.  Casca travles to Arabia where he has heard of a new preacher.  Thinking it is Jesus returning for the Second Coming he finds an Arab called Mohammed.  Joining his growing army, Casca helps unite Arabia under Mohammed, and after his death continues fighting for the Arabs as they pour out of Arabia.  Entering Jerusalem Casca finds the Brotherhood scattered, many of them dead but others gone.

Part of the army that invaded Egypt, he tires of the religious preachings and falls foul of a fanatical iman and is sentenced to death by being cast out into the waterless desert.

After fifty years under a huge sand dune, a storm frees him and Casca wanders the desert, terrorizing the locals who believe him to be a djinn.  Casca has no memory of this, exisitng almost in a zombie-like state, until he stumbles into an oasis and is revived.  Traveling west, he learns that the Arabs have conquered most of North Africa and eventually reaches one of the last outposts of Christianity, the town of Ceuta.  Joining the defenders, they resist a long seige until an agreement is reached.  Casca becomes part of an invading army under Tarik the Moor and they take Spain, defeating the Visigoths in a huge battle.

Settling down in Spain, Casca enjoys a brief period of peace until his village is destroyed and his people killed.  He then wanders north into Aquitaine and enrols into the Frankish army which is preparing to battle the Arabs at Poitiers.  Casca and the Franks are victorious and Casca decides to remain in the new kingdom.

Casca is mentioned in Casca 21: The Trench Soldier that he fought in the campaigns of Charlemagne.

Casca becomes a count and enjoys his time running one of the eastern counties of Francia.  But time is the enemy and he has to leave before awkward questions are asked.  Becoming an ordinary soldier once more, he joins Charlemagne's armies and campaigns against the Basques, Saxons and Avars.  Finally, tiring of the constant wars and Christianizing of Europe, he quits and heads north into the wilderness of Frisia.

Captured by Vikings, he stirs memories of legend from Helsfjord amongst some of them and becomes a war leader, raiding England, Francia and Spain.  But time again compels him to move on, so he travels east into Slavic lands and becomes an explorer with a group of Swedish Vikings who call themselves Rus.  Building a city they call Kiev, he takes part in many raids until he moves on again.

A nomadic tribe pick him up and they call themselves Magyars.  Taking his place in the tribe, they invade Europe and settle in the huge plains where the Huns once ruled.  They raid far and wide and Casca becomes an important member of his village, until sickness claims everyone except him and Casca turns away to the east.

He revisits Kiev, now a glittering capital, and joins Prince Svyatoslav's Guard, fighting the Bulgars and Khazars.  After the Prince's death, Casca volunteers to be one of the group to travel to Byzantium and become one of the Varangian Guard of the emperor Basil.  In the long war against the Bulgars, Casca rises high in the ranks until the conclusive victory at The Struma in 1014.

Wandering after the war's end, he finds himself in the far north and sails across ice-bound seas to the strange land of the Skraelings, who drive the Viking travelers away from the land they call Vinland.  Returning to Europe he finds a farm and settles down in northern France. 

When his farm is burned by bandits, Casca pursues them to Caen where the Norman Duke William is gathering an army to invade Saxon England.  While he picks off the bandits, he learns that their leader is a man high up in the Norman administration.  He also falls in love with a high born girl called Aveline and follows her to England.  At Hastings, Casca emerges on the winning side and is made a Baron of Stokeham, taking Aveline as his.  He finally also deals with the last of those responsible for the destruction of his farm.