Ylva, eldest sibling of Thorfinn and firstborn of Thors and Helga, entered the world in 987 during a grueling birth in Jomsborg. Her father initially voiced disappointment at her gender but honored her by bestowing his mother’s name. After Thors’ presumed death at the Battle of Hjörungavágr, the family fled Jomsborg, Ylva sleeping through the clash with Thorkell. Raised in Iceland, she shouldered household burdens early as Helga’s health faltered and Thorfinn vanished post their father’s demise.

With both gone, Ylva became the sole provider, undertaking backbreaking labor—fishing, whaling, and men’s fieldwork—while tending to domestic tasks like cooking and weaving. Villagers dubbed her a rebel for defying norms, though her relentless toil cloaked unprocessed grief. Helga’s urging finally cracked her stoicism, culminating in a tearful collapse where Ylva released years of pent-up sorrow.

She eventually wed Ari, a local, bearing four children—only son Mar named. Despite building a family, resentment festered toward Thorfinn for abandoning them. His return years later sparked denial, then fury, as she raged at his absence before their tentative reconciliation. Her legendary strength flared when she felled him with one punch, a stark display of her hardened resolve.

Guided by pragmatism, Ylva navigated family obligations and village life, joining whale hunts where her precision with the first harpoon drew respect. Her path wove stoic perseverance with buried anguish, steadying through motherhood and marriage yet forever marked by a fraught bond with her brother, balancing duty and fractured kinship across the years.