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I was thinking of a series of personal unions under one ruler that encompassed roughly OTL Western Roman Empire, the Holy Roman Empire, Ireland, and Croatia. Someone mentioned communication problems. I was going to ask directly on that thread, but now I want a more general response.

Why would a series of kingdoms stretching this far have difficulties? The WRE and HRE in OTL did not have difficulty communicating within. The WRE had plenty of problems, but when it came to talking within, the problem was not incapability of long distance travel but that the Emperors got their information filtered through their decadent court (which in 405-410, proved disastrous). In fact, the distance from Vienna to Ireland is not much more than Rome to the Sinai.

Why would medieval era society be limited by communication problems? I can think of problems such as disloyal nobles, but that is a power balance issue inherent to the feudal system, not a communication problem.
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