Arthur was quite interested in making an appearance at the famous Paris Peace Conference in history.
However, upon reflection, he decided it was better to not. After all, no monarch of any country would personally attend such negotiations, and engaging in idle talk with the officials would be pointless.
Even if Arthur didn't say a word, just sitting there would be uncomfortable. With his presence, officials would not feel at ease fighting for benefits, and Arthur would also be bound by etiquette, making it torturous for himself to sit there.
Instead of joining in the chaos, he thought it wiser to settle domestic affairs at home. After all, the status of a country isn't determined by the size of its aristocratic class but by the strength of its national and military power, which is decided with an iron fist.
As the saying goes, territory is measured by cannons, and coastlines are guarded by ship guns.
Only with strong military power can a country win the respect of others.