Update Thread 40: I'm Running Out of Clever Names

[Mamorien]

Make a move across the Rubicon
Future's knocking at your door
Take your time and choose the road you want
Opportunity is yours

That's not actually the epigraph to this week's A Thing of Vikings, but the chapter title Alea Iacta Est brought it irresistibly to mind.

In the study of ecology, there is the concept of 'carrying capacity'—the amount of a given population that a given region or ecosystem can support.  Various factors limit carrying capacity, typically basic needs like food, water or shelter, but exceeding carrying capacity means that the population can no longer support itself on the resources that were available and will undergo a dieback to below the capacity limit. 
A common misconception is that humanity managed to escape the carrying capacity of the environment by shifting from hunter-gatherer to agricultural, but in truth, we only managed to shift the nature of the carrying capacity limit.  Instead of escape, we had just begun to manipulate the environment to increase the carrying capacity in our favor (and to the general detriment of other species in the environment). 
But the process of that manipulation was and is incremental, and there were and are still diebacks in the form of famine, disease, and other mass fatality events.  Excess capacity for the support of populations and the related productivity surplus rarely kept complete pace with population growth, and was frequently taken from one group by another for their own support (either in the form of external raids/conquest or internal taxation).  The investment of surplus resources into continued growth and environmental manipulation—as well as increased infrastructure designed to help promote per-individual efficiency—was primarily the domain of large empires, many of which fueled their own internal growth by taking resources from conquered populations and regions, and even then, much of these resources were wasted (wars, upper-class lifestyles, etc). 
One of the single largest bursts of surplus and productivity in all of human history occurred with the human-dragon species alliance.  This singular event allowed the two species—similar in social structures and temperaments—to benefit from each other's strengths.  Prior to their alliance with humanity, dragon society was based around small, autocratic hunter-gatherer chiefdoms centered around nesting sites and food sources.  These societies faced horrendously high mortality rates, due to famine and conflict with humans.  Even with several nests having begun a tentative shift to agriculture and fish-farming in the decades before Hiccup Haddock meeting and sparing Toothless, those early farms were limited in output and generally primitive in design (and, according to modern analysis of their design, would have resulted in a population explosion followed by a crash when the new carrying capacity was exceeded and the farms failed from the strain).  It was only a general alliance with humanity that allowed both species to thrive in a true positive-sum manner.  Dragons gained the benefit of humanity's experience with food production, processing and, most importantly, preservation, along with medical care, prenatal care, and more, while humans gained access to dragon labor to help with the construction of infrastructure that would benefit both.  Together, the two species became more than the sum of their parts, and it took decades for the subsequent 'hiccup' of productivity to fully unfold and be integrated by population growth and social development.
What occurred as a result was an explosion of social upheaval.  In the countless generations beforehand, both human and dragon societies had evolved strong traditions designed to maximize the chances of survival, of the individual and of the society as a whole, identifying limits to the environment and behaviors that would result in negative outcomes, resulting in fairly rigid/conservative social expectations and behaviors across politics, economics and military activity.  And, suddenly, much of that traditional wisdom was in doubt—if not outright obsolete—because of the new capacities that abruptly existed.  It took most of a century for new norms to establish themselves, and in that chaotic gap as the carrying capacity increased for both species, truly extraordinary events occurred.

In Constantinople, Sigurd and the upper ranks of the Imperial rule prepare for Hiccup's arrival. Soon thereafter, Wulfhild and her wife and husband meet their escort, which includes her uncle Harald. Hiccup manages not to explode on the trip to the palace. Once they get there, Sigurd laughs a little too hard in Astrid's face; then, Hiccup makes his point about what Snotlout Sigurdlout has done, and goes on to underline it. In the Gleann Dá Loch, in the Cuala Mountains, southwest of Dubh Linn, while Thornado swims in one of the titular two lakes, Stoick reads the mail from home and points beyond. Back in Constantinople, Sigurd must explain himself to his Despoina in her personal office; then, at the Hooligan camp, Hiccup and his wives take another meeting with Harald. In the aftermath of that meeting, Sigurd receives an Imperial honor that might begin to make up for what he's lost...

https://archiveofourown.org/works/104089...s/42278438
https://www.fanfiction.net/s/12639117/80...Of-Vikings