Coja Petrus had settled in Madras barely three years before he had this bridge built. He was quite well off, having been involved in trading between Madras and Manila, where he was based before moving to Madras in 1723. The Marmalong bridge cost him 30,000 pagodas (Rs.100,000), not a small amount in 1726. He did not stop with that; he also gave 1,500 pagodas as a corpus towards regular maintenance of the bridge - that gesture goes a long way towards proving that the bridge was truly built "Pro bono publico".
The Marmalong bridge lasted for over 200 years; it was only in the 1960s that the bridge we use today was built - rather, looking at an old photo of Marmalong bridge, it appears that the existing bridge was strengthened and new lanes added on. The bridge itself was then renamed Maraimalai Adigal Palam. I haven't been able to find too many photos of the old bridge, but here's a painting that supposedly has the bridge in the background!