Pierre Arsenau est né vers 1650. Selon Stephen A. White, son lieu d'origine n'est pas connu.  Son arrivé a Port-Royal semble être après le recensement de 1671. Il était un pilote côtier.
Vers 1672, Pierre collabora avec Jacques Bourgeois pour fonder la colonie Bourgeois, qui devint Beaubassin.
Pierre s'est marié deux fois. Il épousa Marguerite Dugas, fille de Abraham Dugas et de Marguerite Doucet, vers 1675. Le couple a eu deux fils: Pierre (vers 1676) et Abraham (vers 1678).
Vers 1685, Pierre a convolé avec Marie Guérin, fille de François Guérin et d'Anne Blanchard, qui lui a donné six autres fils (Charles, Jacques, François, Anne, Claude (dit Ambroise), Augustin, et Abraham ) et une fille (Anne).
Added by John deRoche 21 Dec 2011: My info is that he was born c1646-1650 in the modern-day "département" of France called Charente-Maritime; died 1710 at Beaubassin in Acadie; occupation, coastal pilot. Married 1st c1675 to Marguerite Dugas (2 children); 2nd c1685/89 to Marie Guérin (6 sons & 1 daughter).
1687 War of the League of Augsburg (King William’s War) starts between England and France
c1690 birth, son Charles
c1692 birth, son Jacques
1690 Phipps captures and sacks Port-Royal, coerces inhabitants' oaths of allegiance to English Crown, sets up local Peacekeeping Council and leaves within 12 days. Seaman from two ships later loot and burn between 28 and 35 homes/habitations including the parish church.”
1693 residence, Beaubassin
c1694 birth, son François
1696 Benjamin Church raids Beaubassin. Once the English ships were seen, the inhabitants fled, carrying their more valuable possessions. Church “…stayed nine days and in his own account …admitted that the settlers’ ”cattle sheep, hogs, and dogs” were left ”lying dead about their houses, chopped and hacked with hatches". The church and some of the houses were also burnt.
c1697 birth, daughter Anne
1698 residence, Beaubassin
c1699 birth, son Claude (dit Ambroise)
c1700 residence, Beaubassin
c1701 birth, son Augustin
c1702 birth, son Abraham (dit le Petit Abram)
1702 War of the Spanish Succession (Queen Anne’s War) starts between England and France
1704: Church raids Beaubassin again: “The Acadians were in arms and an indecisive skirmish ensued. After the Acadians retreated into the woods, Church and his men found that the inhabitants had removed as much of their household and farm goods as possible. Church set the buildings on fire and killed about 100 cattle before leaving to return to Boston”
↑ 4.04.14.2 Griffiths, Naomi E.S., From migrant to Acadian : a North-American border people, 1604-1755, Montreal (Québec), McGill-Queen's University Press, 2005, p147-151 (King William’s War); p 164 (1696 Church raid of Beaubassin); p 208 (1704 Church’s Raid on Beaubassin)); p 267-268 (oaths of allegiance)