No country has claim to Antarctica
Australia may have a territorial claim on the Antarctic continent, but it does not control any part of it.
Several South American countries claim portions of Antarctica, but no country controls the continent, including other countries in the world that also claim portions of Antarctica.
Several nation states claim territory on the Antarctic continent. Several of these claims overlap each other. There are also portions of the continent that are unclaimed. However, since the early 1960s, all the land on earth south of 60 degrees S is governed by the Antarctic Treaty. The treaty holds all claims in abeyance and prohibits future claims.
Antarctica, as it had not made its claim on the continent until 1908.
Great Britain first "controlled" Australia. Great Britain made the first official claim to the continent, and it also established the first permanent settlement.
Continence refers to the individuals ability to control their urinary and bowl functions. If the person can control urinary, he is continent to urine. If he can control bowl movements, he is continent to feces.
It Was Spain
The French make a claim on the Antarctic continent, which is nothing more than a claim. You can read more about France's official claim, below.
In geographical terms the answer is none because there is nobody who can claim that a continent is theirs.
Antarctica is a continent without a country. Whilst many countries claim territory in Antarctica, there are none with a permanent population there.
European countries sent explorers to claim land in the continent. Citizens from these countries then began settling in these colonies.
When? From the time of Julius Caesar on, there were many, many men who tried to claim control. You have to be more specific as to the time you are asking about.