In which year did the construction of the Titanic begin?

The idea of the luxury liner was first conceived of in 1907, but the Titanic construction did not actually begin until March 31, 1909 in Belfast (Ireland). The construction of the Titanic was handled by Harland and Wolff.

The luxury liner and her sister ships made up the 'Olympic class' vessels of the White Star Line and were designed to cater to the most elite of passengers. From the beginning, the Titanic was designed to be the largest ship to ever take to the seas. As such, the White Star Line was determined that no expense would be spared in the Titanic construction. It took 3 years for the Titanic to be completed and in the end it cost $7.5 million dollars for the ship to be finished. More than 3000 men were employed in building the Titanic during that time span. In the months, and even years, leading up to the maiden voyage of the Titanic, the White Star Line published numerous marketing materials claiming that the ship was 'designed to be unsinkable.'