From the longer Wikipedia page .
The Singapore Stone is a fragment of a large sandstone slab which originally stood at the mouth of the Singapore River. The slab, which is believed to date back to at least the 13th century and possibly as early as the 10th or 11th century, bore an undeciphered inscription. Recent theories suggest that the inscription is either in Old Javanese or in Sanskrit. It is likely that the person who commissioned the inscription was Sumatran. The slab was blown up in 1843 to clear and widen the passageway at the river mouth to make space for a fort and the quarters of its commander.
The slab may be linked to the legendary story of the 14th-century strongman Badang (Wikipedia page ), who is said to have thrown a massive stone to the mouth of the Singapore River. On Badang's death, the Rajah sent two stone pillars to be raised over his grave "at the point of the straits of Singhapura".
The Stone, now displayed at the National Museum of Singapore (Wikipedia page ), was designated by the museum as one of 11 "national treasures" in January 2006, and by the National Heritage Board as one of the top 12 artifacts held in the collections of its museums.